Support for openmc.CylindricalMesh

[RemDelaporteMathurin]

This currently doesn't support MeshFilter with CylindricalMesh

[RemDelaporteMathurin]

by replacing _find_coords_of_mesh by

def find_coords_of_mesh(mesh: openmc.CylindricalMesh):

    xs = mesh.r_grid
    ys = mesh.phi_grid
    zs = mesh.z_grid

    return xs, ys, zs

This could work, although it produces a cartesian mesh

[shimwell]

I think a deep dive into the vtk package would be needed

cartesian mesh != CylindricalMesh

[RemDelaporteMathurin]

After a deep dive into the VTK pacakge, I made a PR to OpenMC directly (see openmc-dev/openmc#2096)

This PR also works for RegularMesh and RectilinearMesh so we could potentially get rid of this package if this gets merged in

[shimwell]

Great stuff Remi. These little packages are great places to develop ideas but ultimately it is more ideal if we can move these features in to the main code. This will be particularly nice as the core of this code came from Patrick who is an OpenMC developer so it is one big circle