show text notifications in VR with notify component if in immersive mode

[kfarr]

• should be located in the "lower third" of the screen in the same manner as Quest OS menu bar. In other words, a constant location relative to the user's head (approx Y about 0.05m below eyes; Z about 0.25m ahead of eyes)
• should respect same color scheme and duration to automatically dismiss as desktop mode - (success, error, info types)
• for v1 do not support dismissible = true
• for v1 can support only 1 simultaneous message at a time (ie do not stack messages, unless that is easier to implement)

other questions:

• what is preferred text library? use out of the box a-frame text or troika? what is city builder using?