Add the CoreMIDI framework #3317

Job	Run time
Check formatting	9s
Check MSRV	57s
Lint macOS x86_64	3m 22s
Lint iOS ARMv7s	3m 19s
Lint visionOS Aarch64 simulator	3m 22s
Lint GNUStep + exceptions	1m 29s
Lint header-translator	35s
Lint test-assembly	32s
Test macOS 15 Aarch64	1m 24s
Assembly tests	54s
Compiler UI	49s
Verify header translator output	1m 55s
Check framework features	0s
Test Compiler-RT	48s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test GNUStep with libobjc2 v1.9	1m 9s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	1m 6s
Test GNUStep with libobjc2 v2.1 on nightly	1m 1s
Test GNUStep 32bit	1m 20s
	24m 11s

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