gfx: caching + offscreen infrastructure (pre-scene, from #2109) #4430

Job	Run time
Template generation (score-device-template)	25s
Template generation (score-vfx-template)	23s
Template generation (score-offline-process-template)	20s
Template generation (score-process-template)	14s
Template generation (score-avnd-simple-template)	20s
score-vfx-template (Windows)	10m 33s
score-vfx-template (Ubuntu)	8m 35s
score-avnd-simple-template (Windows)	9m 43s
score-device-template (Ubuntu)	9m 13s
score-process-template (macOS (AArch64))	10m 8s
score-avnd-simple-template (Ubuntu)	10m 23s
score-device-template (Windows)	10m 9s
score-process-template (Ubuntu)	8m 3s
score-vfx-template (macOS (AArch64))	8m 46s
score-offline-process-template (Windows)	9m 5s
score-process-template (Windows)	9m 35s
score-offline-process-template (macOS (AArch64))	11m 44s
score-offline-process-template (Ubuntu)	6m 34s
score-device-template (macOS (AArch64))	8m 8s
score-avnd-simple-template (macOS (AArch64))	8m 19s
	2h 20m 40s

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