chore: introduce enum for sink response type (#115) #48

Job	Run time
Build, Tag, and Push Image (examples/map-cat)	2m 10s
Build, Tag, and Push Image (examples/map-tickgen-serde)	2m 20s
Build, Tag, and Push Image (examples/mapt-event-time-filter)	2m 53s
Build, Tag, and Push Image (examples/reduce-counter)	3m 37s
Build, Tag, and Push Image (examples/sideinput)	3m 14s
Build, Tag, and Push Image (examples/sideinput/udf)	2m 37s
Build, Tag, and Push Image (examples/simple-source)	2m 8s
Build, Tag, and Push Image (examples/sink-log)	2m 22s
Build, Tag, and Push Image (examples/source-transformer-now)	2m 6s
Build, Tag, and Push Image (examples/batchmap-flatmap)	2m 15s
Build, Tag, and Push Image (examples/batchmap-cat)	2m 19s
	28m 1s

Provide feedback