WebXRManager: Allow early set of foveation
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#25282
Merged
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Description
Currently foveation is set to 1.0 on setSession, and there's no way to set it before, because it's not saved anywere when session is not active. So the only way to set it to a non-default value is to call setSession and call setFoveation afterwards. That leads to hacks in certain scenarios like pmndrs/xr#235. This PR allows setting it beforehand, while being backwards compatible
This contribution is funded by Mayflower