fix: Graceful shutdown for all UDFs (#337) #166

Job	Run time
Build, Tag, and Push Image (examples/map/forward_message)	2m 6s
Build, Tag, and Push Image (examples/mapstream/flatmap_stream)	1m 58s
Build, Tag, and Push Image (examples/map/flatmap)	2m 4s
Build, Tag, and Push Image (examples/map/multiproc_map)	1m 56s
Build, Tag, and Push Image (examples/map/even_odd)	1m 52s
Build, Tag, and Push Image (examples/reduce/counter)	2m 6s
Build, Tag, and Push Image (examples/sink/log)	2m 1s
Build, Tag, and Push Image (examples/reducestream/sum)	1m 58s
Build, Tag, and Push Image (examples/reducestream/counter)	2m 6s
Build, Tag, and Push Image (examples/sink/async_log)	2m 5s
Build, Tag, and Push Image (examples/batchmap/flatmap)	2m 7s
Build, Tag, and Push Image (examples/sideinput/simple_sideinput)	2m 8s
Build, Tag, and Push Image (examples/sideinput/simple_sideinput/udf)	2m 9s
Build, Tag, and Push Image (examples/accumulator/streamsorter)	1m 59s
Build, Tag, and Push Image (examples/sourcetransform/event_time_filter)	1m 54s
Build, Tag, and Push Image (examples/source/simple_source)	2m 3s
	32m 32s

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