Merge #300: Add utilities to test persistence

abcf868 refactor: remove bdk_testenv dependency (codingp110)
f539909 docs: document persist_test_utils module (codingp110)
a03d3e3 test: use utils to test file_store and rusqlite (codingp110)
62060fd feat: add utilities to test persistence of wallet (codingp110)

Pull request description:

  <!-- You can erase any parts of this template not applicable to your Pull Request. -->

  ### Description

  Added some basic functions to test `WalletPersister` impl. Fixes #14 and might help with #234 .

  ### Changelog notice

  ```
  Added
      - functions to test `WalletPersister` impl of custom persistence backends.
      - tests for file_store and rusqlite based on persistence testing functions added
  ```

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `just p` before pushing

  #### New Features:

  * [x] I've added tests for the new feature
  * [x] I've added docs for the new feature

ACKs for top commit:
  ValuedMammal:
    ACK abcf868

Tree-SHA512: 854e24ace5366c9bf744db602c99e98849654dc162cd5689b8de49bcdf608a11834875cc9d11086cc5c67ef802eb6ce79c380e56386862644471fbc699fc297a

Author: ValuedMammal

wallet/Cargo.toml

@@ -22,6 +22,8 @@ bitcoin = { version = "0.32.6", features = [ "serde", "base64" ], default-featur
 serde = { version = "^1.0", features = ["derive"] }
 serde_json = { version = "^1.0" }
 bdk_chain = { version = "0.23.1", features = [ "miniscript", "serde" ], default-features = false }
+anyhow = { version = "1.0.98", optional = true }
+tempfile = { version = "3.20.0", optional = true }
 
 # Optional dependencies
 bip39 = { version = "2.0", optional = true }
@@ -35,7 +37,7 @@ all-keys = ["keys-bip39"]
 keys-bip39 = ["bip39"]
 rusqlite = ["bdk_chain/rusqlite"]
 file_store = ["bdk_file_store"]
-test-utils = ["std"]
+test-utils = ["std", "anyhow", "tempfile"]
 
 [dev-dependencies]
 assert_matches = "1.5.0"

wallet/src/lib.rs

@@ -31,6 +31,10 @@ pub mod keys;
 pub mod psbt;
 #[cfg(feature = "test-utils")]
 pub mod test_utils;
+
+#[cfg(feature = "test-utils")]
+pub mod persist_test_utils;
+
 mod types;
 mod wallet;