Support Subdiv Options in MeshTessellate

[danieldresser-ie]

This hooks up the new properties made in: ImageEngine/cortex#1413, so that they can be set by MeshType, and read by MeshTessellate.

I realized one thing we haven't talked about that could be considered necessary for this to be considered complete is hooking these properties up to various renderers. If you can set it using MeshType, that kind of implies that we should try to respect that when passing the mesh to the renderer - Arnold only supports 4 of the 6 options for one of these parameters, and appears to have no support for the other two, but I guess we could at least pass through what does match?

[danieldresser-ie]

While doing some last minute double checking, realized that I hadn't correctly handled indexed constant primvars in the original tessellateMesh PR ... I had test data for it generalTestMesh.usd, but I'd neglected to actually check the result for this case in the reference file I made. Fixed now.

[johnhaddon]

Thanks Daniel! I've noted a few typos and suggested a different plug ordering, but otherwise LGTM. Feel free to just squash any fixes straight it.

I've also updated my dependencies PR to include the Cortex version needed for this PR. Would be good to get some eyes on that today if we can @murraystevenson.

[murraystevenson]

I've also updated my dependencies PR to include the Cortex version needed for this PR. Would be good to get some eyes on that today if we can @murraystevenson.

Dependencies update is ready to go in #5808.

[danieldresser-ie]

Fixed spelling errors, changed plug order, and squashed.

[johnhaddon]

Fixed spelling errors, changed plug order, and squashed.

Sorry, just one more thing - this needs to target 1.4_maintenance rather than main.

[murraystevenson]

Thanks Daniel! Tests are passing with the latest dependencies in place. Merging.