* Introduce `GraphedTx` struct to access transaction data of graphed transactions. * Ability to insert/access anchors and "seen at" values for graphed transactions. * `Additions` now records changes to anchors and last_seen_at.
BDK File Store
This is a simple append-only flat file implementation of
Persist.
The main structure is KeychainStore, which can be used with bdk's
Wallet to persist wallet data into a flat file.