Add GPU upload manager interface and initial implementation #4118

Job	Run time
Linux -> Pre-checks	17s
Linux -> Clang-x64, Debug	13m 23s
Linux -> Clang-NO_GLSLANG-x64, Debug	8m 24s
Linux -> Clang-x64, Release	11m 30s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	6m 33s
Linux -> GCC-x64, Release	10m 22s
Linux -> GCC-x64, Debug	12m 3s
	1h 2m 32s

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