Merge bitcoindevkit/bdk#812: Implement ordering for TransactionDetails

Merge bitcoindevkit/bdk#812: Implement ordering for TransactionDetails

d3d07564f28b68723630fcb03becdc9d5b8d72ae Implement ordering for TransactionDetails (benthecarman)

Pull request description:

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  ### Description

  Pulled from https://github.com/BitcoinDevShop/mutiny-web-poc/pull/189

  Wallets should be able to sort the transactions easily, this makes it so you can just all `sort` on a list of tx details instead of needing to implement the sort_by yourself

  ### 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

ACKs for top commit:
  danielabrozzoni:
    utACK d3d07564f28b68723630fcb03becdc9d5b8d72ae

Tree-SHA512: d2b53dc959897b71d71794f3c919f86f8b7886e6ea5f6ac511cfaca0c19b2f78784a23491b3010380cf41da7ef69fd9ca1be75437c53eca1c60bd6651d1fec41