fix: use keyed_window.keys for task lookup in accumulator task manage… #161

Job	Run time
Build, Tag, and Push Image (examples/map/forward_message)	3m 48s
Build, Tag, and Push Image (examples/map/multiproc_map)	3m 49s
Build, Tag, and Push Image (examples/map/even_odd)	4m 5s
Build, Tag, and Push Image (examples/reducestream/counter)	3m 44s
Build, Tag, and Push Image (examples/sideinput/simple_sideinput)	4m 10s
Build, Tag, and Push Image (examples/map/flatmap)	4m 6s
Build, Tag, and Push Image (examples/reduce/counter)	4m 14s
Build, Tag, and Push Image (examples/batchmap/flatmap)	3m 54s
Build, Tag, and Push Image (examples/mapstream/flatmap_stream)	3m 51s
Build, Tag, and Push Image (examples/reducestream/sum)	3m 58s
Build, Tag, and Push Image (examples/sink/async_log)	3m 56s
Build, Tag, and Push Image (examples/accumulator/streamsorter)	3m 32s
Build, Tag, and Push Image (examples/sourcetransform/event_time_filter)	3m 48s
Build, Tag, and Push Image (examples/sink/log)	3m 55s
Build, Tag, and Push Image (examples/source/simple_source)	3m 53s
Build, Tag, and Push Image (examples/sideinput/simple_sideinput/udf)	4m 17s
	1h 3m 0s

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