Unity Hands API Integration

[Zee2]

This issue has been migrated a new MRTK repository, and the status of this issue will now be tracked at the following location:

• Unity Hands API Integration MixedRealityToolkit/MixedRealityToolkit-Unity#207

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Context

Unity has released (is releasing?) a new Hands API. This issue tracks our integration with their new Hands subsystem, API, OpenXR features, etc.

Todos

• Evaluate whether we can simply drop-in their Hands subsystem
• Figure out whether we can make our hands synthesis subsystem a sibling implementation of the new Hands subsystem
• Take a peek at comparative performance
• Unity fixes the issues with Holographic Remoting
• Evaluate how this will affect Snapdragon Spaces (probably no need for their hands subsystem, either!)

[AMollis]

Tracking this work with the following issues

• Update MRTK3 to use Unity XR Hands package #11680
• Update MRTK3 to use latest XRI components #11679