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Merge bitcoindevkit/bdk#1373: Wrap transactions as `Arc<Transaction>` in `TxGraph`

<a class=hub.com/bitcoindevkit/bdk/commit/<a class="double-link" href="https://git"><a class=hub.com/bitcoindevkit/bdk/commit/8ab58af093ff295b86c3f8189aa96dea313092c4">8ab58af09 feat(chain)!: wrap `TxGraph` txs with `Arc` (志宇)

Pull request description:

  ### Description

  This PR makes `TxGraph` store transactions as `Arc<Transaction>`.

  `Arc<Transaction>` can be shared between the chain-source and receiving structures. This allows the chain-source to keep the already-fetched transactions (save bandwith) and have a shared pointer to the transaction (save memory).

  Our current logic to avoid re-fetching transactions is to refer back to the receiving structures. However, this means an additional round of locking our receiving structures.

  ### Notes to the reviewers

  This will make more sense once I update the esplora/electrum chain sources to make use of both #1369 and this PR. The result would be chain sources which would only require locking the receiving structures twice (once for initiating the update, and once for applying the update).

  ### Changelog notice

  * Changed `TxGraph` to store transactions as `Arc<Transaction>`. This allows chain-sources to cheaply keep a copy of already-fetched transactions.

  ### 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:
  LLFourn:
    ACK 8ab58af093ff295b86c3f8189aa96dea313092c4
  notmandatory:
    ACK 8ab58af093ff295b86c3f8189aa96dea313092c4

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