chore: refactor reduce handler argument (#201) #66

Job	Run time
Build, Tag, and Push Image (examples/map/even_odd)	5m 2s
Build, Tag, and Push Image (examples/map/flatmap)	5m 0s
Build, Tag, and Push Image (examples/map/forward_message)	5m 7s
Build, Tag, and Push Image (examples/map/multiproc_map)	5m 4s
Build, Tag, and Push Image (examples/mapstream/flatmap_stream)	5m 1s
Build, Tag, and Push Image (examples/reduce/counter)	5m 19s
Build, Tag, and Push Image (examples/reducestream/counter)	5m 18s
Build, Tag, and Push Image (examples/reducestream/sum)	5m 20s
Build, Tag, and Push Image (examples/sideinput/simple_sideinput)	5m 6s
Build, Tag, and Push Image (examples/sideinput/simple_sideinput/udf)	5m 46s
Build, Tag, and Push Image (examples/sink/async_log)	5m 4s
Build, Tag, and Push Image (examples/sink/log)	5m 19s
Build, Tag, and Push Image (examples/source/simple_source)	5m 10s
Build, Tag, and Push Image (examples/sourcetransform/event_time_filter)	5m 27s
Build, Tag, and Push Image (examples/batchmap/flatmap)	5m 2s
	1h 18m 5s

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