Add the SceneKit framework #3330

Job	Run time
Check MSRV	1m 0s
Check formatting	10s
Lint macOS x86_64	3m 40s
Lint iOS ARMv7s	3m 40s
Lint visionOS Aarch64 simulator	3m 36s
Lint GNUStep + exceptions	1m 31s
Lint header-translator	32s
Lint test-assembly	29s
Test macOS 15 Aarch64	1m 26s
Assembly tests	52s
Verify header translator output	2m 0s
Test Compiler-RT	28s
Test GNUStep with libobjc2 v1.9	1m 2s
Check framework features	0s
Test GNUStep with libobjc2 v2.0	1m 9s
Test GNUStep with libobjc2 v2.1 on nightly	1m 8s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test on iOS simulator w. dinghy	0s
Test GNUStep 32bit	1m 15s
Compiler UI	45s
	24m 43s

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