Replace flake8 with ruff

[alexrudd2]

ruff is rapidly absorbing lots of linters. I used flake8-to-ruff to generate a config which basically matches the current flake8 configuration.

Integration of bandit is left for later, since it uses the rule names from flake8-bandit which are slightly different.

Note: HomeAssistant has already switched, although their rules are more strict so I did not copy them (yet).

[janiversen]

A couple of comments.
If it makes things simpler then please make a PR that changes from bandit to flake8-bandit.

Can you please ( if you have not already) the rules from HA, commented out, that way it is easier to activate when you find t8mr.

Now to the review

[janiversen]

I like this one.

I just had one small comment.