Extract pytest slow marker tuner into dedicated package

[devin-ai-integration]

Summary

The pytest slow marker tuner (bin/tune_slow_markers.py) should be extracted into its own dedicated package/repository. This tool is useful for any pytest project and could benefit the broader Python testing community.

Current Implementation

The tool currently lives in PyAirbyte's bin/ directory and provides:

• Automated detection of slow tests based on execution time
• AST-based marker addition/removal that preserves code formatting
• Configurable timeout threshold (default: 7.0s)
• Dry-run mode for preview
• Optional removal of slow markers from fast tests
• PEP 723 inline script metadata for standalone execution with uv run

Proposed Changes

1. Create a new repository (e.g., pytest-slow-marker-tuner)
2. Package structure:
   • Convert to a proper Python package with pyproject.toml
   • Add comprehensive tests
   • Add documentation (README, usage examples)
   • Set up CI/CD for testing and publishing
3. Publishing:
   • Publish to PyPI for easy installation
   • Support installation via pipx or uv tool install
4. Integration:
   • Update PyAirbyte to use the published package
   • Provide GitHub Action for easy CI integration

Benefits

• Reusability: Any pytest project can use this tool
• Maintainability: Dedicated repo with its own tests and CI
• Discoverability: PyPI listing makes it easy to find
• Community: Can accept contributions from broader community

References

• Current implementation: feat: Add automated pytest slow marker tuner #836
• Devin session: https://app.devin.ai/sessions/b2bd2fdac9314cf18270c81f81305c55

Requested by: AJ Steers (Aaron ("AJ") Steers (@aaronsteers))