Support LOD and better spatial mesh quality in Scene Understanding

[shukenmg]

Would it be possible to add this extension to control the LOD?

https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#XrMeshComputeLodMSFT

Also, it would be great if spatial mapping could use:

XR_SCENE_COMPUTE_CONSISTENCY_SNAPSHOT_COMPLETE_MSFT 

or

XR_SCENE_COMPUTE_CONSISTENCY_SNAPSHOT_INCOMPLETE_FAST_MSFT 

for better mesh quality https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#xrComputeNewSceneMSFT:~:text=meshes%20that%20do%20not%20overlap%20adjacent%20meshes%20at%20their%20edges

Thank you!