Make Solana Errors concrete types #656

Job	Run time
fmt	5s
clippy	2m 9s
build	2m 24s
tests (coverage-point-calculator)	1m 33s
tests (ingest)	2m 16s
tests (coverage-map)	1m 28s
tests (reward-scheduler)	1m 11s
tests (task-manager)	1m 19s
tests-postgres (boost-manager)	2m 40s
tests-postgres (file-store)	2m 14s
tests-postgres (iot-config)	2m 48s
tests-postgres (iot-packet-verifier)	3m 34s
tests-postgres (iot-verifier)	3m 10s
tests-postgres (mobile-config)	2m 55s
tests-postgres (mobile-packet-verifier)	2m 42s
tests-postgres (mobile-verifier)	3m 4s
build-release	0s
	35m 32s

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