Expose golang `fqbn` package for public use #4883

Job	Run time
run-determination	1s
check-style (./)	54s
check-outdated (./)	14s
build (internal/arduino/discovery/discovery_client)	15s
build (rpc/internal/client_example)	21s
check-config (./)	10s
build (commands/term_example)	28s
check-formatting (./)	9s
check-license-headers (./)	18s
	2m 50s

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