Emscripten build

Add specialization constants support for WGSLShaderResource, with tests. #4228

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Run time

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Job	Run time
Win10 -> Emscripten, Debug	18m 58s
Win10 -> Emscripten, Release	25m 52s
MacOS -> Emscripten, Debug	12m 55s
Linux -> Emscripten, Debug	16m 3s
Linux -> Emscripten, Release	19m 0s
	1h 32m 48s