Support for CylindricalMesh

[RemDelaporteMathurin]

CylindricalMesh would be a very useful feature for fusion applications.

https://docs.openmc.org/en/stable/pythonapi/generated/openmc.CylindricalMesh.html#openmc.CylindricalMesh

[shimwell]

Yep we could get the bounding box to automatically define the height and radius. I don't have any methods of plotting the result but I'm sure we could make something