ruff and isort

[mredaelli]

This is an example of how the source code would look automatically formatted with isort and ruff.

It removes problems of whitespace mismatch, cleans up stuff that can be automatically fixed (like unused imports), makes diffs easier to follow, and improves uniformity in general.

If it is not too painful, I'd recommend adding this to the workflow (it can run automatically when you commit and fix whatever needs to be fixed).

But do not merge this one. It's just to give you a taste :) We can do it when there are no MRs pending so we don't step on each other's feet.