Add helper function to generate .pyi files for modules built agains the vtk-sdk

[AlexyPellegrini]

VTK has a script to generate python interface files (.pyi) from native modules: https://gitlab.kitware.com/vtk/vtk/-/blob/master/Wrapping/Python/vtkmodules/generate_pyi.py?ref_type=heads

This should be working on module build against VTK.