Add BackendOption loading to swift bindings (#18855) (#18855) #34999

Job	Run time
gather-models	10s
test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job	10m 23s
test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job	9m 26s
test-models-linux (cmake, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job	9m 38s
test-models-linux (buck2, mv3, portable, linux.2xlarge, 90) / linux-job	9m 30s
test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job	17m 8s
test-models-linux (cmake, vit, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job	10m 9s
	1h 6m 24s

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