Add OpenXR for developing

[from2001]

I'll add OpenXR and Meta OpenXR to support

• PC-VR development
• Meta Quest development

The packages will be added just to the project, not in dependencies.

[from2001]

Add two packages into the project
"com.unity.xr.meta-openxr": "1.0.1",
"com.unity.xr.openxr": "1.10.0",

[from2001]

Configuration for PC-VR

[from2001]

Configuration for Meta Quest

[from2001]

Two Scripting Define Symbols are added by Project Validation

USE_INPUT_SYSTEM_POSE_CONTROL
USE_STICK_CONTROL_THUMBSTICKS

[from2001]

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