Add the CFNetwork framework #3467

Job	Run time
Check MSRV	1m 7s
Lint iOS ARMv7s	4m 51s
Lint visionOS Aarch64 simulator	4m 42s
Lint macOS x86_64	4m 39s
Lint test-assembly	34s
Lint header-translator	35s
Lint GNUStep + exceptions	1m 38s
Check formatting	12s
Test macOS 15 Aarch64	2m 29s
Compiler UI	45s
Assembly tests	53s
Verify header translator output	4m 0s
Test Compiler-RT	29s
Test GNUStep with libobjc2 v1.9	1m 7s
Test GNUStep with libobjc2 v2.0	1m 11s
Test GNUStep 32bit	1m 16s
Test GNUStep with libobjc2 v2.1 on nightly	1m 7s
format('{0} {1}', matrix.test && 'Test' \|\| 'Build', matrix.name)	0s
Test on iOS simulator w. dinghy	0s
Check framework features	0s
	31m 35s

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