Added `BoardIdentify` gRPC call. #4972

Job	Run time
run-determination	1s
check-formatting (./)	10s
check-outdated (./)	9s
check-style (./)	48s
build (internal/arduino/discovery/discovery_client)	16s
check-config (./)	11s
check-license-headers (./)	16s
build (rpc/internal/client_example)	21s
build (commands/term_example)	22s
	2m 34s

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