Add type stubs for 3rd party packages

[clokep]

When mypy doesn't know what a type is it treats it as Any, this has lead to bugs that we thought mypy was catching. We should consider if we should flesh our more of our type hints from 3rd party modules instead of ignoring them.

There's also the https://github.com/python/typeshed/ project, but according to that README it is included in mypy. It doesn't seem like there's too many projects available in that TBH.

[clokep]

See the conversation around #9223 (comment) about this.

[clokep]

I'm going to say that #11006 has fixed this. Hopefully additional packages keep having stubs (or ship type hints), but I don't think this is actionable as-is.