"unbounded" space should be recommended for "immersive-ar" sessions

[thetuvix]

Right now, Babylon.js is discouraging use of the "unbounded" reference space in "immersive-ar" sessions. While the unbounded space will be most useful across AR phones/tablets and AR headsets once the anchors module has shipped, it is already useful on devices like HoloLens 2, as it's the only space that enables tagalong content to continue rendering when the user walks through an untracked hallway into a new room.

Babylon.js/src/XR/webXRExperienceHelper.ts

Line 105 in cab0386

if (sessionMode === "immersive-ar" && referenceSpaceType !== "local") {

[RaananW]

Thanks! Will change that very soon