Looking for collaborators with an interest in KHR_xmp_json_ld

Open Brush and Open Blocks is going to need something like this to track authorship and licences in assets composed of multiple assets.

We don't have the resources to do this alone and I'm trying to resist the temptation to solve this in an ad hoc way.

So - this issue is a intended as a placeholder to see if anyone else has an interest in this and might want to share the burden.

For future reference - this might be useful to refer to: https://github.com/aaronfranke/godot-gltf-khr-xmp-copyright

Review the KHR_xmp_json_ld proposal and the linked godot-gltf-khr-xmp-copyright project to establish scope for UnityGLTF. This issue is a collaborator placeholder and defines no files, tests, or acceptance criteria, so completion is not specified.

Written by the indexing model from the issue text.