Add 'Metal' feature for iOS/macOS uses CAMetalLayer on UIView/NSView #8084

Job	Run time
Check formatting	14s
Check for typos	10s
Minimize JavaScript	11s
Run cargo-deny on Android	30s
Run cargo-deny on macOS	25s
Run cargo-deny on Windows	23s
Run cargo-deny on Redox OS	28s
Run cargo-deny on Linux	23s
Run cargo-deny on iOS	28s
Run cargo-deny on web	25s
Test stable Windows 64bit MSVC	3m 26s
Test stable Windows 64bit GNU	2m 16s
Test stable Linux 64bit	1m 54s
Test stable Windows 32bit MSVC	1m 45s
Test stable Wayland	1m 35s
Test stable Linux 32bit	2m 12s
Test stable Android	1m 20s
Test stable macOS	1m 12s
Test stable Redox OS	35s
Test stable iOS x86_64	46s
Test stable Windows 32bit GNU	2m 30s
Test nightly Linux 32bit	2m 10s
Test nightly Windows 64bit GNU	3m 18s
Test nightly Windows 32bit MSVC	1m 58s
Test nightly Linux 64bit	1m 38s
Test stable X11	1m 38s
Test nightly Windows 32bit GNU	2m 12s
Test stable iOS Aarch64	52s
Test nightly Android	1m 11s
Test nightly macOS	1m 0s
Test nightly X11	1m 35s
Test stable web	1m 32s
Test nightly Windows 64bit MSVC	1m 43s
Test nightly Wayland	1m 34s
Test 1.70.0 Windows 32bit MSVC	1m 4s
Test 1.70.0 Windows 64bit MSVC	1m 27s
Test nightly iOS x86_64	52s
Test nightly Redox OS	29s
Test nightly web	1m 23s
Test 1.70.0 Linux 32bit	1m 36s
Test nightly iOS Aarch64	55s
Test 1.70.0 Windows 32bit GNU	1m 33s
Test 1.70.0 Windows 64bit GNU	1m 48s
Test 1.70.0 Linux 64bit	1m 12s
Test 1.70.0 Wayland	55s
Test 1.70.0 Redox OS	31s
Test 1.70.0 macOS	42s
Test 1.70.0 X11	1m 3s
Test nightly web Atomic	1m 35s
Test 1.70.0 Android	51s
Test 1.70.0 iOS Aarch64	38s
Test 1.70.0 web	59s
Test 1.70.0 iOS x86_64	44s
	1h 5m 46s

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