[feat] init shenyu java client

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: 🐛 Bug Report
+description: Problems and issues with code of Apache ShenYu 🤔.
+title: "[BUG] <title>"
+labels: ["type: bug"]
+body:
+- type: checkboxes
+  attributes:
+    label: Is there an existing issue for this?
+    description: Please search to see if an issue already exists for the bug you encountered.
+    options:
+      - label: I have searched the existing issues
+        required: true
+- type: textarea
+  attributes:
+    label: Current Behavior
+    description: A concise description of what you're experiencing.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Expected Behavior
+    description: A concise description of what you expected to happen.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Steps To Reproduce
+    description: Steps to reproduce the behavior.
+    placeholder: |
+      1. In this environment...
+      2. With this config...
+      3. Run '...'
+      4. See error...
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Environment
+    description: |
+      examples:
+        - **ShenYu version(s)**: 2.4.0
+    value: "ShenYu version(s):"
+    render: markdown
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Debug logs
+    description: |
+      Add your debug logs here.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Anything else?
+    description: |
+      Links? References? Anything that will give us more context about the issue you are encountering!
+
+        Tip: You can attach images or log files by clicking this area to highlight it and then dragging files in.
+  validations:
+    required: false

.github/ISSUE_TEMPLATE/config.yml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: 🚀 Feature Request
+description: I have a suggestion (and may want to implement it 🙂)!
+title: "[Feature] <title>"
+labels: ["type: new feature"]
+body:
+- type: textarea
+  attributes:
+    label: Feature Request
+    description: >
+      Tip: Have you checked the docs https://shenyu.apache.org/docs/index/, GitHub issues whether someone else has already reported your issue? Maybe the feature already exists?
+    placeholder: >
+      A concise description of what you're experiencing.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Is your feature request related to a problem? Please describe
+    description: A clear and concise description of what the problem is. Ex. I have an issue when [...]
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Describe the solution you'd like
+    description: A clear and concise description of what you want to happen. Add any considered drawbacks.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Describe alternatives you've considered
+    description: A clear and concise description of any alternative solutions or features you've considered.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Additional context
+  validations:
+    required: false
+- type: markdown
+  value: "Please read the [Contribution Guideline](https://shenyu.apache.org/community/contributor) before submitting the PR"

.github/ISSUE_TEMPLATE/question.yml

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+name: 🤔 Question
+description: Usage question that isn't answered in docs or discussion
+title: "[Question] <title>"
+labels: ["type: question"]
+body:
+- type: textarea
+  attributes:
+    label: Question
+    placeholder: >
+      your question here;
+  validations:
+    required: true
+- type: markdown
+  attributes:
+    value: |
+      Please pay attention on issues you submitted, because we maybe need more details.
+      If no response anymore and we cannot reproduce it on current information, we will **close it**.
+

.github/ISSUE_TEMPLATE/task.yml

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+name: 🚀 Task
+description: Used to create tasks for the community.
+title: "[Task] <title>"
+labels: ["status: volunteer wanted"]
+body:
+- type: textarea
+  attributes:
+    label: Description
+    placeholder: A clear and concise description of Task
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Task List
+    placeholder: |
+      1. Task1...
+      2. Task2...
+      3. Task3...
+      4. Task4...
+  validations:
+    required: false
+- type: markdown
+  attributes:
+    value: |
+      Please read the [Contribution Guideline](https://shenyu.apache.org/community/contributor) before submitting the PR

.github/ISSUE_TEMPLATE/volunteer.yml

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+name: 🤔 Volunteer
+description: Some volunteer help
+title: "[Volunteer] <title>"
+labels: ["status: volunteer wanted"]
+body:
+- type: textarea
+  attributes:
+    label: Volunteer help
+    placeholder: >
+      your need volunteer help here;
+  validations:
+    required: true
+- type: markdown
+  attributes:
+    value: |
+      Please read the [Contribution Guideline](https://shenyu.apache.org/community/contributor) before submitting the PR
+

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Describe your PR here; e.g. Fixes #issueNo -->
+
+<!--
+Thank you for proposing a pull request. This template will guide you through the essential steps necessary for a pull request.
+-->
+Make sure that:
+
+- [ ] You have read the [contribution guidelines](https://shenyu.apache.org/community/contributor-guide).
+- [ ] You submit test cases (unit or integration tests) that back your changes.
+- [ ] Your local test passed `./mvnw clean install -Dmaven.javadoc.skip=true`.

.github/filters.yml

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+changed:
+  - "!**/{\
+    *.md,*.txt,\
+    resources/static/**,\
+    .asf.yaml,.gitignore,.licenserc.yaml,\
+    LICENSE,NOTICE,\
+    Makefile,\
+    shenyu-e2e/**, \
+    .github/(ISSUE_TEMPLATE/**|PULL_REQUEST_TEMPLATE)\
+    }"
+pom:
+  - "**/pom.xml"
+e2e:
+  - "!**/{\
+    *.md,*.txt,\
+    resources/static/**,\
+    .asf.yaml,.gitignore,.licenserc.yaml,\
+    LICENSE,NOTICE,\
+    Makefile,\
+    .github/(ISSUE_TEMPLATE/**|PULL_REQUEST_TEMPLATE)\
+    }"

.github/workflows/ci.yml

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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: ci
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        java: [ 8, 11, 17 ]
+        os: [ ubuntu-latest ]
+    runs-on: ${{ matrix.os }}
+    if: (github.repository == 'apache/shenyu-client-java')
+    steps:
+      - name: Support longpaths
+        if: ${{ matrix.os == 'windows-latest'}}
+        run: git config --system core.longpaths true
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - uses: dorny/paths-filter@v2
+        id: filter
+        with:
+          filters: '.github/filters.yml'
+          list-files: json
+      - name: Restore ShenYu Maven Repos
+        if: steps.filter.outputs.changed == 'true'
+        id: restore-maven-cache
+        uses: actions/cache/restore@v3
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - uses: actions/setup-java@v1
+        if: steps.filter.outputs.changed == 'true'
+        with:
+          java-version: ${{ matrix.java }}
+      - name: Build with Maven
+        if: steps.filter.outputs.changed == 'true'
+        run: ./mvnw -B clean test -Prelease
+      - uses: codecov/codecov-action@v1
+        with:
+          token: 2760af6a-3405-4882-9e61-04c5176fecfa
+        if: steps.filter.outputs.changed == 'true'
+      - name: Save ShenYu Maven Repos
+        if: steps.filter.outputs.changed == 'true' && steps.restore-maven-cache.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v3
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+
+  check-license-header:
+    name: check-license-header
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Check License Header
+        uses: apache/skywalking-eyes@9bd5feb86b5817aa6072b008f9866a2c3bbc8587
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  requirement:
+    name: build
+    if: always()
+    needs:
+      - build
+    runs-on: ubuntu-latest
+    steps:
+      - name: checking job status
+        run: |
+          [[ "${{ needs.build.result }}" == "success" ]] || exit -1
+

.github/workflows/codeql-analysis.yml

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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "CodeQL"
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**/*.java'
+  pull_request:
+    paths:
+      - '**/*.java'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    if: (github.repository == 'apache/shenyu')
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ['java']
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Set up JDK 8
+        uses: actions/setup-java@v3
+        with:
+          java-version: 8
+          distribution: 'temurin'
+
+      - name: Restore ShenYu Maven Repos
+        id: restore-maven-cache
+        uses: actions/cache/restore@v3
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v2
+        with:
+          languages: ${{ matrix.language }}
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v2
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v2