Add BackendOption loading to swift bindings (#18855) (#18855) #5135

Job	Run time
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	24m 4s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	25m 25s
test-arm / test-backend-macos	0s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	19m 43s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	18m 29s
test-arm / package-golden-artifacts	46s
	1h 28m 27s

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