Add the WatchKit framework #3336

Job	Run time
Check formatting	11s
Check MSRV	56s
Lint macOS x86_64	3m 45s
Lint iOS ARMv7s	4m 12s
Lint visionOS Aarch64 simulator	3m 50s
Lint GNUStep + exceptions	1m 31s
Lint header-translator	31s
Lint test-assembly	31s
Test macOS 15 Aarch64	1m 39s
Check framework features	0s
Assembly tests	0s
Compiler UI	0s
Verify header translator output	0s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
${{ matrix.name }}	0s
Test Compiler-RT	0s
Test on iOS simulator w. dinghy	0s
	17m 6s

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