Add the CoreMedia framework #3191

Job	Run time
Check MSRV	54s
Check formatting	9s
Lint macOS x86_64	2m 54s
Lint iOS ARMv7s	2m 59s
Lint visionOS Aarch64 simulator	2m 53s
Lint GNUStep + exceptions	1m 23s
Lint header-translator	34s
Lint test-assembly	30s
Test macOS 15 Aarch64	1m 28s
Assembly tests	51s
Verify header translator output	1m 35s
Test Compiler-RT	29s
Check framework features	0s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test GNUStep with libobjc2 v1.9	1m 13s
Compiler UI	44s
Test GNUStep with libobjc2 v2.0	1m 11s
Test GNUStep with libobjc2 v2.1 on nightly	56s
Test GNUStep 32bit	1m 21s
Test on iOS simulator w. dinghy	0s
	22m 4s

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