Serialize/flatbuffer to program #4999

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	24m 59s
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	16m 12s
test-xnnpack / test-backend-macos	0s
test-xnnpack / package-golden-artifacts	2m 12s
	43m 23s

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