Full CUDA Training+Sampling Implementation

[ejaszewski]

This PR includes work done by Addis Dittebrandt to add a full CUDA implementation of sampling and training. Preliminary results have been verified in an internal development build of RenderMan.

After discussion with Sebastian, we want to merge this into the wip/gpu-port branch to do some additional work before we consider the GPU support work finished.

[linux-foundation-easycla]

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