Implements post-process film grain effects #52783

Job	Run time
build-and-install-on-iOS	-1s
build-without-default-features	-1s
build-without-default-features-status	-1s
check-unused-dependencies	-1s
run-examples-on-wasm	-1s
check-example-showcase-patches-still-work	-1s
build-android	-9s
	-15s

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