ci: Add Python CI workflow with matrix testing and caching

[SoClosee]

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

• Matrix Testing: Runs tests on multiple Python versions (3.8, 3.9, 3.10) to ensure compatibility.
• Dependency Caching: Utilizes caching for pip dependencies to speed up the installation process.
• Linting: Includes a separate job to run linting using flake8 to maintain code quality.

This setup ensures that any changes are tested across multiple environments and that dependencies are efficiently managed.

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