feat: asset verification

[agaffney]

Fixes #104

[agaffney]

$ ./cdnsd 
{"level":"info","timestamp":"2024-02-03T17:45:40-06:00","caller":"indexer/indexer.go:104","msg":"starting new chainsync at configured location: 50844079, 81325118471fddb00a20327572b371aee7cce13b846a18500d011b9cefd2a34c"}
{"level":"info","timestamp":"2024-02-03T17:45:41-06:00","caller":"chainsync/chainsync.go:216","msg":"connected to node at preprod-node.world.dev.cardano.org:30000"}
{"level":"info","timestamp":"2024-02-03T17:45:42-06:00","caller":"cdnsd/main.go:88","msg":"starting DNS listener on :8053"}
{"level":"info","timestamp":"2024-02-03T17:45:44-06:00","caller":"indexer/indexer.go:256","msg":"found updated registration for domain: treehouse.cardano."}
{"level":"info","timestamp":"2024-02-03T17:45:44-06:00","caller":"indexer/indexer.go:256","msg":"found updated registration for domain: dolphin.cardano."}
{"level":"warn","timestamp":"2024-02-03T17:45:44-06:00","caller":"indexer/indexer.go:207","msg":"ignoring datum for domain \"whale.cardano.\" with no matching asset"}
{"level":"warn","timestamp":"2024-02-03T17:45:44-06:00","caller":"indexer/indexer.go:207","msg":"ignoring datum for domain \"dolphin.cardano.\" with no matching asset"}
{"level":"warn","timestamp":"2024-02-03T17:45:45-06:00","caller":"indexer/indexer.go:224","msg":"ignoring datum with record \"orca.ergo.\" outside of origin domain (orca.cardano.)"}
{"level":"warn","timestamp":"2024-02-03T17:45:46-06:00","caller":"indexer/indexer.go:188","msg":"ignoring datum for domain \"ghost.cardano.\" with no matching asset"}
{"level":"info","timestamp":"2024-02-03T17:45:49-06:00","caller":"indexer/indexer.go:256","msg":"found updated registration for domain: cardano."}
{"level":"info","timestamp":"2024-02-03T17:46:09-06:00","caller":"indexer/indexer.go:256","msg":"found updated registration for domain: village.cardano."}
{"level":"warn","timestamp":"2024-02-03T17:46:09-06:00","caller":"indexer/indexer.go:207","msg":"ignoring datum for domain \"city.cardano.\" with no matching asset"}
{"level":"info","timestamp":"2024-02-03T17:46:09-06:00","caller":"indexer/indexer.go:256","msg":"found updated registration for domain: enclave.cardano."}
{"level":"warn","timestamp":"2024-02-03T17:46:09-06:00","caller":"indexer/indexer.go:188","msg":"ignoring datum for domain \"town.cardano.\" with no matching asset"}
{"level":"info","timestamp":"2024-02-03T17:46:11-06:00","caller":"indexer/indexer.go:256","msg":"found updated registration for domain: county.cardano."}
{"level":"info","timestamp":"2024-02-03T17:46:21-06:00","caller":"indexer/indexer.go:59","msg":"caught up to chain tip"}