Add BackendOption loading to swift bindings (#18855) #4147

Job	Run time
test-coreml / test-backend-macos (coreml, operators) / macos-job	9m 41s
test-coreml / test-backend-macos (coreml, models) / macos-job	12m 32s
test-coreml / test-backend-linux	0s
test-coreml / package-golden-artifacts	0s
	22m 13s

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