55b9b8792c
Whenever an `Announcement` is parsed as transparent transaction info, we obtain information about the UTXOs involved in that transaction. It would be nice to display this information when we look up the UTXO, but there is no way to query it from neptune-core. This commit caches that information in order to display it. Specifically, it extends `AppState` with a (smart pointer to) vector of `TransparentUtxoInfo` (a new type). The vector, or its existing entries, are extended with new information when it becomes available. At this point the vector is rather silly because it is not persisted, and the app reboots more often than not, resulting in a clear cache. A future commit will persist this data.