Proof of Concept: XR Camera Movement

[hysw]

Move camera using controller.

This is a proof of concept implementation

• controller direction for movement direction
• use the select button for moving (which conflict with the current ImGui integration)
• fixed 1m/s movment speed

I'd like to add joystick input, however that's not a part of khr/simple_controller. It will need to add device specific config, e.g. /interaction_profiles/oculus/touch_controller, which is not addressed here.