Added `BoardIdentify` gRPC call. #5000

Job	Run time
run-determination	1s
check-outdated (./)	11s
check-config (./)	10s
check-formatting (./)	13s
check-style (./)	54s
build (internal/arduino/discovery/discovery_client)	5s
check-license-headers (./)	15s
build (rpc/internal/client_example)	18s
build (commands/term_example)	21s
	2m 28s

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