Implement tracked radios cache #682

Job	Run time
build	4m 3s
fmt	24s
clippy	2m 9s
tests (coverage-map)	1m 51s
tests (coverage-point-calculator)	1m 36s
tests (ingest)	2m 18s
tests (reward-scheduler)	1m 11s
tests (task-manager)	1m 23s
tests-postgres (boost-manager)	3m 37s
tests-postgres (file-store)	2m 35s
tests-postgres (iot-config)	2m 53s
tests-postgres (iot-packet-verifier)	4m 47s
tests-postgres (iot-verifier)	4m 10s
tests-postgres (mobile-config)	3m 20s
tests-postgres (mobile-packet-verifier)	3m 39s
tests-postgres (mobile-verifier)	4m 11s
build-release	0s
	44m 7s

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