Add py.typed to vtkmodules for Python type checking

Merged David Gobbi requested to merge dgobbi/vtk:18739-python-typed into master

Per PEP 561, the presence of a py.typed file indicates that there is type information (the .pyi files) for the Python VTK modules. The pyi files aren't perfect, so YMMV when you use them for static analysis of your VTK programs.

Closes #18739 (closed)

Edited by David Gobbi

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