Added `BoardIdentify` gRPC call. (#2794) #5036

Job	Run time
run-determination	1s
check-outdated (./)	8s
check-style (./)	47s
check-config (./)	9s
check-formatting (./)	14s
build (internal/arduino/discovery/discovery_client)	12s
check-license-headers (./)	22s
build (rpc/internal/client_example)	20s
build (commands/term_example)	24s
	2m 37s

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