ci: Add Python CI workflow with matrix builds and linting

[SoClosee]

This PR adds a GitHub Actions workflow for continuous integration. The workflow includes:

• Matrix Builds: Tests the code against multiple Python versions (3.8, 3.9, 3.10) to ensure compatibility.
• Dependency Caching: Uses caching for pip dependencies to speed up installation times.
• Test Execution: Runs unit tests using pytest.
• Linting: Checks code quality using flake8.
• Concurrency Control: Cancels in-progress runs if a new run is triggered on the same branch or ref.

This setup ensures that the project is tested and linted efficiently across multiple Python versions, helping to catch issues early in the development process.

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