[Not for land] Util for saving quantized model #1676

Job	Run time
test-advanced-mps-macos / macos-job	10m 20s
test-quantization-mps-macos / macos-job	10m 26s
test-gguf-mps-macos / macos-job	9m 56s
test-readme-mps-macos / macos-job	6m 43s
	37m 25s

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