Pose storage

[grebz-dev]

Omniverse does not natively support storing poses manually configured by manipulating skeleton joints, as it considers them "transient prims." As pose control has been a desired feature from users, we could add this. There are several approaches of various degrees of integration.

Store custom prim data for poses
Extend USD schema to allow manual posing
Saving PreviewSkelAnims currently created to display transient state

(potentially out of scope)

[cadop]

I think trying a low-hanging fruit of storing joint angles through a previewskelanim would be nice