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Support KHR_materials_unlit
Extension spec: https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_unlit
The extension can not be correctly represented with a UsdPreviewSurface, but we might be able to emulate it using the emissive color.
In MaterialX, this feature should be covered by the recently introduced 'unlit' shader node: https://github.com/AcademySoftwareFoundation/MaterialX/pull/860