Move sqlx importing under feature directive (#903) #535

Job	Run time
fmt	14s
clippy	1m 19s
build	4m 4s
tests (ingest)	2m 19s
tests (coverage-point-calculator)	1m 45s
tests (coverage-map)	1m 26s
tests (reward-scheduler)	51s
tests (task-manager)	55s
tests-postgres (boost-manager)	3m 15s
tests-postgres (file-store)	2m 16s
tests-postgres (iot-config)	2m 51s
tests-postgres (iot-packet-verifier)	4m 31s
tests-postgres (iot-verifier)	3m 41s
tests-postgres (mobile-config)	2m 45s
tests-postgres (mobile-packet-verifier)	3m 24s
tests-postgres (mobile-verifier)	3m 43s
build-release	0s
	39m 19s

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