Add support for render elements VrayMetalness & VrayRoughness with Vray GPU

V-Ray V-Ray for 3ds Max Requests
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Just like we have with Vray CPU. Useful for baking with Vray GPU, and for various post-render tasks.

Submitted on AHA Ideas (VRAYMAX-I-201).

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AHA Ideas status: New.
Set during AHA Ideas to Discourse migration.