ci: Add Python CI workflow with matrix 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 to speed up dependency installation by reusing cached dependencies from previous runs.
• Test Execution: Runs unit tests using pytest for each Python version in the matrix.
• Linting: Lints the code using flake8 to enforce coding standards.

This setup ensures that any changes are tested against multiple environments and adhere to coding standards before being merged into the main branch.

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