added pre-commit

[jstucke]

• replaced "qb" github action with pre-commit
  • added pre-commit config with ruff and ruff format
• converted setup.py to modern pyproject.toml format
  • added ruff config to pyproject.toml
  • updated auto-pip.sh script (caution: the build package must be installed)

future work: Add a GitHub action that runs pre-commit (there are still many issues in the code that need fixing first)

[jstucke]

The tests are a bit flaky on the slower GitHub action workers but should get fixed later down the line (in 5833277 to be precise)