Make linting consistent with blossom

[TimJentzsch]

This PR ports over the linting setup from Blossom to ToR, to have a consistent setup across all our repositories.

• Add ruff linter and configuration
• Fix lint errors
• Add pre-commit hook configuration

[itsthejoker]

Pytz is deprecated - we'll need to use zoneinfo instead. https://docs.python.org/3/library/zoneinfo.html

[TimJentzsch]

Pytz is deprecated - we'll need to use zoneinfo instead. https://docs.python.org/3/library/zoneinfo.html

Nice, didn't know this was a built-in thing! I ended up using datetime.timezone.utc which is a nice replacement. I'll open up an issue to migrate for blossom and buttercup as well.

[itsthejoker]

And I didn't know that datetime.timezone.utc was a thing! 🎉