ci: Add Python CI workflow with matrix testing and linting

[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: Uses pip caching to speed up dependency installation.
• Linting: Includes a separate job for linting the codebase using flake8.

This setup ensures that any changes are tested across multiple Python versions and adheres to coding standards before being merged into the main branch.

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