update pre-commit-config replacing black and pylint with ruff

[theorashid]

This is for #350, because I too wanted to replace black with ruff. There's a lot going on here but it's largely cosmetic. After changing the pre-commit file following the pytensor pre-commit config I:

• ran pre-commit run --all-files
• manually changed the remaining errors rather than using the --unsafe-fixes option. These were largely import errors (F401) or Local variable mu is assigned to but never used (F841, common when people write pymc models in tests).

The dubious ones that I changed which might be bugs were:

• gp.latent_approx.py L144 mu = self.mean_func(X) never used? Should it be?
• statespace e.g. def rv_op( # noqa: F811. I added the skip here but rv_op is specified above (e.g. rv_op = LinearGaussianStateSpaceRV) then overwritten in a class method. Just checking the desired behaviour

[theorashid]

Couple of follow ups:

• why is conftest.py in the root. is that normal?
• can the setup.py/setupegg.py/pyproject.toml be consolidated into just pyproject.toml (happy to give this a go)
• can I add .venv/ and python-version to the .gitignore for those of us who use venv/pyenv instead of conda

[zaxtax]

Should this be combined with #368 ?

[theorashid]

Working with @jessegrabowski to merge ours together. No need to review