Add the CoreText framework #3173

Job	Run time
Check formatting	12s
Lint macOS x86_64	2m 46s
Check MSRV	54s
Lint iOS ARMv7s	2m 32s
Lint visionOS Aarch64 simulator	2m 30s
Lint GNUStep + exceptions	1m 17s
Lint header-translator	27s
Lint test-assembly	26s
Test macOS 15 Aarch64	1m 19s
Assembly tests	49s
Verify header translator output	1m 7s
Check framework features	0s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test Compiler-RT	28s
Test GNUStep with libobjc2 v1.9	59s
Test GNUStep with libobjc2 v2.0	1m 7s
Test on iOS simulator w. dinghy	0s
Compiler UI	50s
Test GNUStep with libobjc2 v2.1 on nightly	53s
Test GNUStep 32bit	1m 16s
	19m 52s

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