Add initial support for MaterialX conversion through PolySpatial #725
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This PR adds support for conversion of the UnityGLTF/PBRGraph and UnityGLTF/UnlitGraph shaders to MaterialX through Unity's PolySpatial module. This allows building glTF-powered volumetric applications for VisionOS.
Due to a bug in PolySpatial (reported as IN-72885, related to HDR color properties), emission colors and emission textures currently aren't converted correctly.