Immersive-ar session for phone based AR headsets

[HyroVitalyProtago]

For now, immersive-ar sessions on phones is for normal usage (hand handled), but it would be interesting to allow a distinction between: ar-session (currently immersive-ar) and "real" immersive-ar sessions like in vr headset with passthrough capabilities with stereoscopic rendering that can be used with something like zapbox.

[AdaRoseCannon]

This seems like something UAs could choose to do without needing to add anything to the standard