This pull request migrates the project from using setuptools to Poetry, in line with PEP 517, to improve the project's overall development experience and maintainability. The key enhancements include:

• Streamlined dependency management, ensuring consistent and deterministic builds across environments.
• Simplified package publishing, reducing the complexity of deployment.
• Seamless integration with virtual environments, improving isolation and consistency.

With this migration, the project benefits from a more robust build process, ultimately contributing to higher code quality and a smoother development workflow.

In addition to poetry, I have also updated the remaining "meta" packages (mypy, black, pre-commit etc.):

• Upgraded pre-commit modules to their latest versions, ensuring adherence to current best practices and coding standards.
• Performed an update of all code files to ensure they pass the newly configured pre-commit checks, enhancing overall code quality and consistency.
• Replaced Flake with Ruff, a modern and extensible linting tool, for more accurate and configurable code analysis. This switch allows us to maintain a high level of code quality while also tailoring the linter to our project's specific needs.