Add full suite of warnings to stubs parser from mypy

[miratepuffin]

Need to add docs warns for several known issues which keep popping up, notably:

• Warnings for no docs
• Missing paramters + have a type + is a valid type
• Missing return type if we have a return block.
• Missing return
• Run mypy against the tests (this checks that the functions being tested have the correct stubs)

Add these warnings to the CI, along with tidy check for python.