Add the ModelIO framework #3334

Job	Run time
Check formatting	15s
Check MSRV	55s
Lint macOS x86_64	3m 43s
Lint iOS ARMv7s	3m 53s
Lint visionOS Aarch64 simulator	3m 47s
Lint GNUStep + exceptions	1m 31s
Lint header-translator	29s
Lint test-assembly	29s
Test macOS 15 Aarch64	1m 46s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Verify header translator output	0s
Check framework features	0s
Assembly tests	0s
Test Compiler-RT	0s
${{ matrix.name }}	0s
Test on iOS simulator w. dinghy	0s
Compiler UI	0s
	16m 48s

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