Adding vtkhdf option to write vtk data

[jon-proximafusion]

Description

As discussed in #3113 it would be great to have a method of writing VTKHDF files for mesh tally data.

This PR allows users to write .hdf file VTKHDF compatible files with the existing UnstructuredMesh.write_data_to_vtk() method. This has a few advantages over the legacy vtk files we currently write.

It would be particularly useful for those of us who can't make use of the vtk package in their environment. We have this issue at the moment and can't import cadquery along with openmc due to slightly different vtk packages. It is super useful that vtk is an optional dependency in openmc and not mandated. This use of h5py lets us avoid using the vtk package while still being able to write VTKHDF files

For interested people the VTKHDF roadmap is here, the ability to read these files (ending with hdf) was introduced in Paraview 5.13.0 release notes.

All credit goes to the Kitware developers and particularly @mwestphal who introduced me to this feature

Fixes # (issue)
partly addresses #3113

Checklist

• I have performed a self-review of my own code
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)