Added `upload --upload-field key=value` flag to set upload fields value #3504

Job	Run time
run-determination	1s
check-style (./)	50s
check-outdated (./)	14s
build (arduino/discovery/discovery_client)	1m 4s
check-formatting (./)	12s
build (client_example)	49s
check-config (./)	11s
check-license-headers (./)	27s
build (commands/daemon/term_example)	32s
	4m 20s

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