Asset Idea: schema tests and minimal foundations for animation

[hybridherbst]

As far as I'm aware in USD many things can be bound to something / have time samples attached to them but I haven't seen a comprehensive list or simple examples on the various ways that can be achieved.

Some examples of what I think would be interesting:

• structurally simple minimal cases
• structurally complex but content-wise minimal samples
• various ways of animating xform transforms (e.g. via pos/rot/scale or transform)
• examples for material animation
• minimal skinned mesh animation examples
• examples on how to reference animation data on multiple objects
• examples on how to reference animation data from other files

and probably more. Some of them might be trivial once there's better payload/referencing samples but I think it's still valuable to have some of these specifically for animation.

[jcowles]

Thanks for adding this!