Added `BoardIdentify` gRPC call. #4975

Job	Run time
run-determination	1s
check-outdated (./)	13s
build (internal/arduino/discovery/discovery_client)	15s
check-config (./)	9s
build (rpc/internal/client_example)	21s
check-formatting (./)	7s
check-license-headers (./)	17s
build (commands/term_example)	19s
check-style (./)	47s
	2m 29s

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