vtkHDF: Add support for polyhedron cells

When you do convene the larger discussion about polyhedron organization, please include me if external participants are welcome. Arbitrary polyhedra are critical to Ansys/Synopsys fluids simulations.

posted here: Polyhedron face connectivity improvements - #2 by mwestphal

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Support for writing polyhedral cells with vtkHDFWriter has just been merged to VTK:
https://gitlab.kitware.com/vtk/vtk/-/merge_requests/12947

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