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notmandatory 
Merge bitcoindevkit/bdk#1473: Remove `persist` submodule

a0bf45bef docs: remove PersistBackend from docs, Cargo.toml and wallet README.md (Steve Myers)
feb27df18 feat(chain)!: add `take` convenience method to `Append` trait (志宇)
1eca568be feat!: rm `persist` submodule (志宇)

Pull request description:

  ### Description

  @LLFourn suggested these changes which greatly simplifies the amount of code we have to maintain and removes the `async-trait` dependency. We remove `PersistBackend`, `PersistBackendAsync`, `StageExt` and `StageExtAsync` completely. Instead, we introduce `Wallet::take_staged(&mut self) -> Option<ChangeSet>`.

  The original intention to keep a staging area (`StageExt`, `StageExtAsync`) is to enforce:
  1. The caller will not persist an empty changeset.
  2. The caller does not take the staged changeset if the database (`PersistBackend`) fails.

  We achieve `1.` by returning `None` if the staged changeset is empty.

  `2.` is not too important. The caller can try figure out what to do with the changeset if persisting to db fails.

  ### Notes to the reviewers

  I added a `take` convenience method to the `Append` trait. I thought it would be handy for the caller to do a staging area with this.

  ### Changelog notice

  * Remove `persist` submodule from `bdk_chain`.
  * Change `Wallet` to outsource it's persistence logic by introducing `Wallet::take_staged`.
  * Add `take` convenience method to `Append` trait.

  ### 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 `cargo fmt` and `cargo clippy` before committing

  #### New Features:

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

ACKs for top commit:
  notmandatory:
    ACK a0bf45bef1b53f8aec273f7... (continued)

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