Implement Message for AnyClass and AnyProtocol #3131

Job	Run time
Check formatting	10s
Lint macOS x86_64	2m 23s
Check MSRV	50s
Lint iOS ARMv7s	2m 18s
Lint visionOS Aarch64 simulator	2m 18s
Lint GNUStep + exceptions	1m 21s
Lint header-translator	26s
Lint test-assembly	23s
Test macOS 15 Aarch64	2m 18s
Compiler UI	45s
Assembly tests	50s
Verify header translator output	51s
Check framework features	0s
Test Compiler-RT	28s
Test GNUStep with libobjc2 v1.9	35s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	55s
Test GNUStep with libobjc2 v2.1 on nightly	53s
Test GNUStep 32bit	58s
	18m 42s

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