TYP: Autotyping
Running autotyping on pandas https://github.com/JelleZijlstra/autotyping

Would be great to add it to pre-commit but before that many abstractmethods need return type annotations (autotyping let's them return `None` or wait for https://github.com/JelleZijlstra/autotyping/issues/33).


closes #46337
xref #47497
This should be ready from my perspective @mroeschke Can work on integrating autotyping into the CI after its next release. Thanks @twoertwein! 