Add MPEG_anchor

[haudiobe]

To support XR experiences where virtual content is seamlessly inserted into the user’s real environment, MPEG-SD allows the content creator to describe the spatial relationships between the virtual objects and particular real locations. The AR anchor corresponds to a fixed position in the XR space of a trackable, i.e., an element of the real environment of which features are available and/or could be extracted. To support a variety of indoor and outdoor XR experiences, several types of trackables are defined such as, controller-based, horizontal, or vertical planes, 2D or 3D marker, geospatial coordinates.

[CLAassistant]

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1 out of 3 committers have signed the CLA.

✅ ibouazizi
❌ lelievres
❌ haudiobe
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