Sample Scene: Add BoundaryVisualizationExample to MRTK3

[AMollis]

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

• Sample Scene: Add BoundaryVisualizationExample to MRTK3 MixedRealityToolkit/MixedRealityToolkit-Unity#147

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MRTK2 Scene Name

BoundaryVisualizationExample

Overview

This scene demonstrates visualizing the boundary geometry and a rectangular playspace inscribed within those bounds."

Additional Context

• This is only needed for non HoloLens 2 applications
• There is no MRTK3 component for boundaries, but a sample might be useful.

[AMollis]

Cutting this sample