…t` with redesigned structures.

75f8b81 Update documentation (志宇)
cff9211 [wallet_redesign] Clean up and document address methods (志宇)
a7668a2 [wallet_redesign] Modified `insert_tx` to use lowest checkpoint (志宇)
ac80829 Rename fields of `tx_graph::Additions` (Shourya742)
1c3cbef [chain_redesign] Remove old structures (志宇)
5860704 Implement redesigned versions of `EsploraExt` and `EsploraAsyncExt` (志宇)
2952341 Update the `wallet_electrum` example (志宇)
78a7920 `bdk_electrum` API improvements and simplifications (志宇)
92709d0 Various tweaks to code arrangement and documentation (志宇)
50425e9 Introduce `keychain::LocalChangeSet` (志宇)
a78967e [example-cli] simplify new address logic (LLFourn)
6a1ac7f [examples_redesign] Implemented `example_electrum` (志宇)
f55974a [examples_redesign] Introduce `example_cli` package (志宇)
2e3cee4 [electrum_redesign] Introduce redesigned `ElectrumExt` (志宇)
7261669 Add `last_seen` to the the `ConfirmationTime::Unconfirmed` variant (志宇)
aba8813 [wallet_redesign] Move the majority of `Update` to `bdk_chain` (志宇)
e69fccb [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 75f8b81
  danielabrozzoni:
    Partial ACK 75f8b81 - the Wallet code looks good to me, I don't have a good enough understanding of the esplora/electrum code to confidently ACK it.

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