[3.x] GLTF: Move shared defines into a file and only list used extensions #69320
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This PR backports #63373 and #63399 to Godot 3.x. Does not break compat.
I am planning to backport the entire GLTF module similarly to what #49120 did, but it's a lot safer and easier to review if I do it in small chunks. So here's the first small chunk which backports two PRs. And yes, I tested it.