Add the QuickLookThumbnailing framework #3421

Job	Run time
Check formatting	17s
Check MSRV	1m 10s
Lint macOS x86_64	4m 19s
Lint iOS ARMv7s	4m 30s
Lint visionOS Aarch64 simulator	4m 21s
Lint GNUStep + exceptions	1m 37s
Lint header-translator	34s
Lint test-assembly	33s
Test macOS 15 Aarch64	1m 50s
Assembly tests	52s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Check framework features	0s
Verify header translator output	2m 46s
Test Compiler-RT	29s
Test GNUStep with libobjc2 v1.9	3m 2s
Test GNUStep with libobjc2 v2.0	1m 10s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.1 on nightly	2m 8s
Compiler UI	49s
Test GNUStep 32bit	1m 12s
	31m 39s

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