Basic linting

[mschwoer]

WHO
Developers
WHAT
Have properly linted code
WHY
Best practises, less overhead when developing

AC

• Code is linted once using ruff (with sensible defaults), all issues are fixed (either by code changes or by applying noqa)
• pre-commit hook is in place that takes care about the linting (also in CI)
• add default pre-commit hooks (whitespaces, line-endings)
  cf. #153: apply ruff default formatting alphabase#154