For vtk in python, add typing + `py.typed` so vtk code can be type checked properly
See also https://peps.python.org/pep-0561/ and http://www.mypy-lang.org
Right now, mypy
can't even catch wrongly typed function names, like:
camera = vtkCamera()
camera.SetProsition() # instead of SetPosition
Adding a py.typed
file to the python package would catch these basic errors, even without adding more "real" typing information.