MRTK3 should allow the HoloLen app to position the native keyboard using Windows' HolographicKeyboard.SetPlacementOverride method

[AMollis]

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

• MRTK3 should allow the HoloLen app to position the native keyboard using Windows' HolographicKeyboard.SetPlacementOverride method MixedRealityToolkit/MixedRealityToolkit-Unity#64

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Describe the problem

There is no way to programmatically to position HoloLens' native keyboard.

Describe the solution you'd like

MRTK3 should allow the HoloLen app to position the native keyboard using Windows' HolographicKeyboard.SetPlacementOverride method.

Using HolographicKeyboard.SetPlacementOverride, MRTK3 could provide a mechanism allowing an application to position the keyboard. This would also require some sort of UX to allow the users to position the keyboard, since calling HolographicKeyboard.SetPlacementOverride will disable the system's affordances for moving the keyboard.

Describe alternatives you've considered

None

Additional context

Impacts HoloLens only