feat: add comprehensive integration test script

[LunaStev]

This PR introduces tools/run_tests.py, a robust Python-based automation script designed to streamline the integration testing process for the wavec compiler. This script replaces manual test execution, providing a standardized and efficient way to verify compiler stability and catch regressions.

Key Features

1. Automated Test Discovery

• Scans the test/ directory for all files matching the test*.wave pattern.
• Special Case Handling: Includes logic to manage directory-based tests (e.g., test28), ensuring complex test structures are executed correctly.

2. Execution & Safety

• Execution Target: Runs tests against the release build of the compiler (target/release/wavec).
• Timeout Protection: Implements a strict 5-second timeout per test case to prevent the testing suite from hanging due to infinite loops or deadlocks in the generated code.

3. Enhanced Terminal UI/UX

Uses colored output for immediate visual feedback:

• BLUE: Indicates a test has started.
• GREEN: Successful execution (PASS).
• RED: Execution failed (FAIL) with the specific exit code displayed.
• YELLOW: Test exceeded the time limit (TIMEOUT).

4. Post-Run Reporting

• Provides a comprehensive summary at the end of the session.
• Categorizes and lists every test by its result status (Passed, Failed, or Timed Out) for quick debugging.

Workflow Requirements

To ensure the script functions correctly, the compiler must be built in release mode beforehand:

cargo build --release
python3 tools/run_tests.py

Benefits

• Stability: Easily verify that new features (like the recent expression parser refactor) don't break existing functionality.
• Efficiency: Reduces the time required for pre-release verification from minutes to seconds.
• Visibility: Clear, color-coded logs make it obvious where the compiler is failing.