Curves are not taking deform_keys into account

[sebastienblor]

Shapes can have a primvar primvars:arnold:deform_keys to control the amount of time samples to be used for deformation blur.
This is handled in meshes and points, but currently not in curves. Related to internal ticket HTOA-2385

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-15561