linter: ruff coverage

[jku]

The various linters have been replaced by ruff (thanks to @L77H).

• We should have a look at the ruff rulesets and decide which are most interesting (and best value for effort): https://docs.astral.sh/ruff/rules/
• Also should look at current ignores (both noqa comments and the ignore list in pyproject) and see if we can improve code

As a initial list, these contain useful rules

• RUF
• UP: this contains "use f-string instead of format" error which we're going to see a lot of. flynt tool may allow automated conversion to f-strings but we need to be very careful with that
• pylint extended rulesets PLR, PLE, PLC, PLW
• various flake rulesets: ANN at least

I have not tested how much work enabling them would be -- starting with the easiest may be a good idea

[L77H]

I tested the initial list you proposed:

• Using PL as a rule includes the following: PLR, PLE, PLC, PLW so those are already covered
• UP finds a total of 44 errors, of which most are f-string related as you already assumed
• ANN finds a total of 532 errors

I believe this is a good starting point to be added, I will create a separate PR for both UP and ANN if you agree.

[jku]

Using PL as a rule includes the following: PLR, PLE, PLC, PLW so those are already covered

oh that makes sense -- I got tricked since pycodestyle is documented the same way but that one doesn't seem to have a "top-level" ruleset

Which reminds me: pycodestyle warnings (W) might be useful to enable as well

[L77H]

Yes the markup is a bit confusing. Good, I will add W to the TODO list.