Add the `CoreFoundation` framework #3164

Job	Run time
Check MSRV	47s
Lint macOS x86_64	2m 27s
Lint iOS ARMv7s	2m 31s
Lint visionOS Aarch64 simulator	2m 25s
Check formatting	8s
Lint GNUStep + exceptions	1m 17s
Lint header-translator	26s
Lint test-assembly	31s
Test macOS 15 Aarch64	2m 20s
Verify header translator output	53s
Assembly tests	49s
Check framework features	0s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test Compiler-RT	25s
Test GNUStep with libobjc2 v1.9	1m 20s
Test on iOS simulator w. dinghy	0s
Compiler UI	50s
Test GNUStep with libobjc2 v2.0	1m 15s
Test GNUStep with libobjc2 v2.1 on nightly	53s
Test GNUStep 32bit	2m 1s
	21m 18s

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