[ET Device Support] DeviceAllocator interface and DeviceAllocatorRegistry #1848

Job	Run time
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	27m 47s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	25m 52s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	17m 39s
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	18m 48s
test-arm / test-backend-macos	0s
test-arm / package-golden-artifacts	44s
	1h 30m 50s

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