chore(shadertools); Add uniforms for pbrMaterial extensions #2394
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Background
This PR adds the necessary uniforms to the pbrMaterial shader module to be able to pass parameters coming from the glTF material extensions (KHR_materials_*). This includes uniforms for specular, ior, transmission, volume, clearcoat, sheen, iridescence, anisotropy, etc. Additionally the corresponding defines (HAS_SPECULARCOLORMAP …) and extra samplers are made available in GLSL/WGSL.
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