Customise or better default for severity level?

[lkhphuc]

Hi, I found that currently most diagnostics, except for two, are assigned the severity level of "Warning".

It would be nice if this can be customised via user's settings.

Otherwise would you be open to a PR just extending the current behaviour to consider some diagnostic with "Information" or "Hint" level by default like ARG, SIM, PTH?

[tylerlaprade]

I heavily customized flake8 severity levels before switching to ruff, and I had much fewer plugins for it than I use in Ruff: "flake8.severity": {"F": "Error", "E999": "Error", "E": "Warning", "W": "Information", "B": "Error", "C": "Information", "H601": "Information"}

I would like the option to customize the severities as I see fit, preferably in my .ruff.toml, so that I can enforce violations I deem to be Errors to block pull requests in my CI while not blocking on Warnings or below.