Introduce MultimethodLoraConfig #7524

Job	Run time
test-executorch-metal-build / macos-job	5m 13s
export-model-metal-artifact (openai, whisper-large-v3-turbo, non-quantized) / macos-job	8m 0s
export-model-metal-artifact (nvidia, parakeet-tdt, non-quantized) / macos-job	9m 18s
export-model-metal-artifact (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job	14m 41s
export-model-metal-artifact (openai, whisper-small, non-quantized) / macos-job	7m 20s
export-model-metal-artifact (nvidia, parakeet-tdt, quantized-int4-metal) / macos-job	9m 36s
test-metal-backend-modules / macos-job	8m 20s
test-model-metal-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job	8m 5s
test-model-metal-e2e (openai, whisper-small, non-quantized) / macos-job	5m 32s
test-model-metal-e2e (openai, whisper-large-v3-turbo, non-quantized) / macos-job	6m 19s
test-model-metal-e2e (nvidia, parakeet-tdt, quantized-int4-metal) / macos-job	4m 43s
test-model-metal-e2e (nvidia, parakeet-tdt, non-quantized) / macos-job	4m 53s
	1h 32m 0s

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