Merge bitcoindevkit/bdk#976: Reimplement `Wallet`, `ElectrumExt` and `Esplora{Async...

75f8b81d58a985669ce7302fe235ad68eddc0d47 Update documentation (志宇)
cff92111d500fbcdd70015c03bf57b386d473fba [wallet_redesign] Clean up and document address methods (志宇)
a7668a2f3e98b8950a139b7c88fbebff56f49a5f [wallet_redesign] Modified `insert_tx` to use lowest checkpoint (志宇)
ac80829caa4bc94de0acdd0459917d095358559c Rename fields of `tx_graph::Additions` (Shourya742)
1c3cbefa4df7a4f93bc95203534da8ea0186fc5a [chain_redesign] Remove old structures (志宇)
5860704b2dfab5d3883fc89960ce4a69b92b65ef Implement redesigned versions of `EsploraExt` and `EsploraAsyncExt` (志宇)
2952341e5245acef14623b482095526d55b64bd6 Update the `wallet_electrum` example (志宇)
78a7920ba378bb57f0b61d93faf29ec813889a75 `bdk_electrum` API improvements and simplifications (志宇)
92709d03ce8ed979cda127c2c30811bb1c8c5f58 Various tweaks to code arrangement and documentation (志宇)
50425e979bdbe81621fcd54463cdc7c7aeed90f0 Introduce `keychain::LocalChangeSet` (志宇)
a78967e51ba1fa94f00a0f7a580dfc009428a947 [example-cli] simplify new address logic (LLFourn)
6a1ac7f80a7f97cd3c6264fb54f2d1e3b1f95130 [examples_redesign] Implemented `example_electrum` (志宇)
f55974a64bd0f5f2ef9e95831c2fb5d4f92f8282 [examples_redesign] Introduce `example_cli` package (志宇)
2e3cee4bd0568073e42e5670476febddd85a7b36 [electrum_redesign] Introduce redesigned `ElectrumExt` (志宇)
7261669c097791ee2ff8c7da6754868732d02eb3 Add `last_seen` to the the `ConfirmationTime::Unconfirmed` variant (志宇)
aba88130d91b329d8637c450c84fd10af508bdac [wallet_redesign] Move the majority of `Update` to `bdk_chain` (志宇)
e69fccb15fb17ba6eb86e24efad4b9bd96e3bf72 [wallet_redesign] Update `Wallet` with redesigned structures (志宇)

Pull request description:

  ### Description

  Closes #938

  * Update `Wallet` to use redesigned structures.
  * Update `bdk_electrum::ElectrumExt` to produce updates for redesigned structures.
  * Update `bdk_esplora::EsploraExt` and `bdk_esplora::EsploraAsyncExt` to produce updates for redesigned structures.
  * Added `example-crates/example_cli` library for implementing examples with redesigned structures.
  * Added `example-crate/example_electrum` which is an electrum CLI wallet using the redesigned structures.
  * Updated `example-crate/{wallet_electrum|wallet_esplora|wallet_esplora_async}` examples to use redesigned structures.
  * Remove all old structures.

  ### Notes to the reviewers

  ~These changes bump our `all-features` MSRV to `1.60.0` because of the introduction of `bdk_esplora`. As long as the `bdk_chain` and `bdk_wallet` crates hit a MSRV of `1.48.0`, it will be fine (this work is done in #987).~ No longer needed due to #993

  ~I had to comment out the examples that use `Wallet` with our chain sources. Once we update the helper-packages for those chain sources, we can also update the examples.~

  Possible future improvements for `ElectrumExt`:

  * Remove requirement to retry obtaining ALL data after reorg is detected. Transactions can be anchored to a lower block (not block tip), and an `assume_final_depth` value can be used.

  * The logic to finalize an update with confirmation time can be improved during reorgs to not require returning an error.

  * Use the subscription model of electrum, as intended by the API.

  ### Changelog notice

  ### 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:

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

ACKs for top commit:
  LLFourn:
    ACK 75f8b81d58a985669ce7302fe235ad68eddc0d47
  danielabrozzoni:
    Partial ACK 75f8b81d58a985669ce7302fe235ad68eddc0d47 - the Wallet code looks good to me, I don't have a good enough understanding of the esplora/electrum code to confidently ACK it.

Tree-SHA512: d1d2b79e3c28fbe826044a8b5ef9b122c2dcfc0d371f24cc4aac7f286500b587c2dc3b06ca6461c8721adbc29f56ca41e7566eace560b0a9c541604e6a225c61