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Merge bitcoindevkit/bdk#1487: Add support for custom sorting and deprecate BIP69

3bee563c8 refactor(wallet)!: remove TxOrdering::Bip69Lexicographic (nymius)
e5cb7b206 feat(wallet): add TxOrdering::Custom (FadedCoder)

Pull request description:

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  ### Description

  Resolves https://github.com/bitcoindevkit/bdk/issues/534.

  Resumes from the work in https://github.com/bitcoindevkit/bdk/pull/556.

  Add custom sorting function for inputs and outputs through `TxOrdering::Custom` and deprecates `TxOrdering::Bip69Lexicographic`.

  <!-- Describe the purpose of this PR, what's being adding and/or fixed -->

  ### Notes to the reviewers

  I tried consider all discussions in https://github.com/bitcoindevkit/bdk/issues/534 while implementing some changes to the original PR. I created a summary of the considerations I had while implementing this:

  ##### Why use smart pointers?
  The size of enums and structs should be known at compilation time. A struct whose fields implements some kind of trait cannot be specified without using a smart pointer because the size of the implementations of the trait cannot be known beforehand.

  ##### Why `Arc` or `Rc` instead of `Box`?
  The majority of the useful smart pointers that I know (`Arc`, `Box`, `Rc`) for this case implement `Drop` which rules out the implementation of `Copy`, making harder to manipulate a simple enum like `TxOrdering`. `Clone` can be used instead, implemented by `Arc` and `Rc`, but not implemented by `Box`.

  #####  Why `Arc` instead of `Rc`?
  Multi threading I guess.

  ##### Why using a type alias like `TxVecSort`?
  cargo-clippy was accusing a too complex type if using the whole type inlined in the struct inside the enum.

  ##### Why `Fn` and not `FnMut`?
  `FnMut` is not allowed inside `Arc`. I think this is due to the `&mut self` ocupies t... (continued)

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