Abstract data set processing to a trait #77

Job	Run time
clippy	1m 34s
build	2m 18s
fmt	3s
tests (ingest)	1m 32s
tests (file-store)	1m 23s
tests (mobile-packet-verifier)	1m 42s
tests (reward-scheduler)	44s
tests (task-manager)	48s
tests-postgres (boost-manager)	2m 11s
tests-postgres (iot-config)	2m 18s
tests-postgres (iot-packet-verifier)	3m 25s
tests-postgres (iot-verifier)	2m 2s
tests-postgres (mobile-config)	2m 20s
tests-postgres (mobile-verifier)	2m 14s
build-release	0s
	24m 34s

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