Modernize project structure and tooling

[jdesboeufs]

This PR modernizes the addok-sqlite-store repository to align with current Python packaging standards and development practices.

Changes

Packaging

• Migrate to pyproject.toml: Replace legacy setup.py with modern declarative configuration using setuptools ≥65.0
• Update Python support: Drop Python 3.4-3.6, add support for Python 3.9-3.14
• Remove MANIFEST.in: No longer needed with modern pyproject.toml configuration
• Add development dependencies: pytest ~8.3, pytest-cov ~6.1, build ~1.2, twine 6.1.0

CI/CD

• Add GitHub Actions workflow: Automated testing on push and pull requests
• Python matrix testing: Test against Python 3.9 and 3.14
• Redis service integration: Proper Redis setup for integration tests
• Coverage reporting: pytest-cov integration for test coverage

Development

• Add Makefile: Standardized commands for development workflow
  • make develop: Install package in development mode
  • make test: Run test suite
  • make testcoverage: Run tests with coverage report
  • make dist: Build distribution packages
  • make upload: Upload to PyPI
  • make clean: Clean build artifacts

Documentation

• Improve README: Add features section, installation instructions, and consistent formatting
• Update LICENSE: Change copyright holder to "République Française"

Housekeeping

• Update .gitignore: Add dist/ and venv/ entries

Compatibility

This update maintains backward compatibility for users of the package. The plugin continues to work the same way, with the same configuration options and entry points.