[XR] Implement anchor support #7917
Description
Implement WebXR (AR) Anchor support, based on the API described here - https://github.com/immersive-web/anchors/
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Implement WebXR (AR) Anchor support, based on the API described here - https://github.com/immersive-web/anchors/