[Draft] iOS support #9516

Job	Run time
test-executorch-metal-build / macos-job	5m 21s
test-metal-backend-modules / macos-job	8m 51s
export-model-metal-artifact (mistralai, Voxtral-Mini-4B-Realtime-2602, quantized-int4-metal) / macos-job	22m 31s
export-model-metal-artifact (openai, whisper-small, quantized-int4-metal) / macos-job	7m 56s
export-model-metal-artifact (mistralai, Voxtral-Mini-3B-2507, quantized-int4-metal) / macos-job	12m 1s
export-model-metal-artifact (nvidia, parakeet-tdt, quantized-int4-metal) / macos-job	10m 9s
export-model-metal-artifact (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job	14m 28s
export-model-metal-artifact (openai, whisper-large-v3-turbo, non-quantized) / macos-job	9m 2s
export-model-metal-artifact (nvidia, parakeet-tdt, non-quantized) / macos-job	9m 27s
export-model-metal-artifact (openai, whisper-small, non-quantized) / macos-job	7m 39s
export-model-metal-artifact (openai, whisper-large-v3-turbo, quantized-int4-metal) / macos-job	7m 58s
test-model-metal-e2e	0s
	1h 55m 23s

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