[tryceratops] Add BaseException to raise-vanilla-class rule (TRY002)

[epenet]

Fixes #12612

[github-actions]

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[MichaReiser]

Code looks good to me. We only have to decide on #12612 (comment)

[AlexWaygood]

This makes sense to me. It's unfortunate to deviate from tryceratops here, but I think it definitely makes sense to include BaseException as well as Exception.

Should we also include ExceptionGroup and BaseExceptionGroup, though? (That's a genuine question that I'm not sure the answer to -- I haven't had much opportunity to use these fancy new features yet! It might be that they belong in this rule, or it might be that they deserve their own rule... not sure.)

[AlexWaygood]

Let's land this for now, we can tackle the ExceptionGroup and BaseExceptionGroup issues as a followup. I think this is a strict improvement.

Thanks @epenet!