✨ add Python 3.7 compatibility

[techouse]

This pull request adds support for Python 3.7 to the project, updating configuration files, documentation, and code to ensure compatibility. It also includes minor code refactoring to remove the use of assignment expressions (walrus operator), which are not available in Python 3.7, and adjusts development dependencies.

Python 3.7 Support

• Updated pyproject.toml, tox.ini, and GitHub Actions workflow (test.yml) to include Python 3.7 in the supported Python versions, classifiers, and test environments. [1] [2] [3] [4] [5]
• Changed the minimum required Python version from 3.8 to 3.7 in pyproject.toml and updated the documentation in CONTRIBUTING.md to state support for Python 3.7 and above. [1] [2]

Code Compatibility Adjustments

• Refactored code in src/qs_codec/encode.py, src/qs_codec/utils/decode_utils.py, and tests/unit/decode_test.py to remove assignment expressions (walrus operator :=), ensuring compatibility with Python 3.7. [1] [2] [3] [4]

Development Dependency Updates

• Adjusted development dependencies in pyproject.toml to use versions compatible with Python 3.7.

Tooling Configuration

• Updated tool.black and tool.mypy settings in pyproject.toml to target Python 3.7. [1] [2]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/py37-support

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