AR Foundation support

[De-Panther]

Currently we switch to AR by using AR Cameras. The Hit-Test that is currently implemented don't use Unity's API.

The WebXR AR Modules now support:

• Hit Test: https://immersive-web.github.io/hit-test/
• World Mesh: https://immersive-web.github.io/real-world-meshing/
• Anchors: https://immersive-web.github.io/anchors/
• Depth Texture: https://immersive-web.github.io/depth-sensing/
• Lighting Estimation: https://immersive-web.github.io/lighting-estimation/
• Raw Camera Access: https://immersive-web.github.io/raw-camera-access/

Needs to figure out the equivalent XR Subsystems in Unity and in AR Foundation, and see how can some of those APIs can be adapted.

[De-Panther]

AR Foundation features https://docs.unity3d.com/Packages/[email protected]/manual/features/features.html