Migrate azure-search-documents to TypeSpec

[alzimmermsft]

Description

Initial work to migrate azure-search-documents to TypeSpec.

Further work is needed for the following:

• Artifact version updates to new major version
• Updates to Java TypeSpec generator to support typed WithResponse APIs rather than using BinaryData
• Rerecording of tests
• Capturing all the breaking changes and how to migrate to the new version

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.