Replacing legacy vtk file writing with h5py file writing for meshes, geometry and tracks for paraview > 5.13.0

[shimwell]

Description

I'm attending at a Paraview presentation by @mwestphal and heard about this nice new feature that I think we should make use of in openmc.

Paraview is supporting hdf5 files if written in a specific way with h5py 🎉 .

Here is the relevant blog post https://www.kitware.com/how-to-write-time-dependent-data-in-vtkhdf-files/ with a nice example of writing the data using h5py

This is interesting for me because:

• We currently have a vtk dependency which could be removed
• We already have h5py as a dependency which can be utilized more
• The vtk files we currently write are legacy format and not recommend by paraview anymore
• The hdf5 files we could write for our 3d data to would be smaller in size and quicker to load than the .vtk files

The parts of the code that could be updated are

• tracks writing to vtk
• geometry writing to vtk
• mesh writing to vtk

Alternatives

Stick with the current solutions, or add an arg to allow "legacy" vtk file writing

Compatibility

Will require ParaView 5.13.0 or newer to open the hd5f based files