Turso implementation for `WalletPersister`

[notmandatory]

Description

Turso is an in-process SQL database, compatible with SQLite. Besides being implemented natively in Rust it also provides on-disk/at-rest data encryption. It would be useful to add turso as a WalletPersister implementation that also includes an option to enable on-disk encryption.

Expected Outcomes

• Create a new bdk_turso crate similar to the bdk_redb crate.
• Add an implementation of the WalletPersister trait for the new bdk_turso data store.
• In the bdk_turso crate include a feature to enable on-disk encryption. It should also include helper function to securely generate a 256 bit encryption key, re-key an existing database with a new key and add encryption to an unencrypted database.
• Add tests in bdk_turso to confirm data is accurately stored and retrieved with and without encryption enabled.
• Create an example similar to SQLite Database that demonstrates using bdk_turso instead of sqlite, with and without encryption enabled.

Resources

• bdk_wallet
• turso
• WalletPersister Trait
• bdk_redb

Skills Required

• Experience with git. Guide
• Experience with rust. First seven chapters of the book
• Able to setup a local core node in regtest and testnet mode.
• Familiarity with database technologies like SQL and SQLite.

Mentor(s)
@notmandatory

Difficulty
Hard

Competency Test

• Install rust, compile and run all bdk examples and tests.
• Setup a local Bitcoin Core node daemon in regtest mode.
• Make a wallet with bitcoind_rpc example wallet and receive and send regtest bitcoin.