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Merge bitcoindevkit/bdk#1390: Make Wallet require a change descriptor

<a class=hub.com/bitcoindevkit/bdk/commit/8bc3d35f6c83d078551c4bc57f72f13324865486">8bc3d35f6<a href="https://github.com/bitcoindevkit/bdk/commit/c5a3b62d633fc1fa0ebda144237de96dbe1636d6"> fix(wallet): `LoadError::MissingDescriptor` includes the missing KeychainKind (valued mammal)
<a class="double-link" href="https://github.com/bitcoindevkit/bdk/commit/412dee1f5b027af7800ee155717d47f4ab4b60e0">412dee1f5</a><a href="https://github.com/bitcoindevkit/bdk/commit/c5a3b62d633fc1fa0ebda144237de96dbe1636d6"> ref(wallet)!: Make `Wallet::public_descriptor` infallible (valued mammal)
</a><a class="double-link" href="https://github.com/bitcoindevkit/bdk/commit/c2513e1090374d7871a8623845bd10757e6ab0b3">c2513e109</a><a href="https://github.com/bitcoindevkit/bdk/commit/c5a3b62d633fc1fa0ebda144237de96dbe1636d6"> test(wallet): Clarify docs for get_funded_wallet (valued mammal)
</a><a class="double-link" href="https://github.com/bitcoindevkit/bdk/commit/9d954cf7d25d43c77115cd931407005a09365389">9d954cf7d</a> refactor(wallet)!: Make Wallet require a change descriptor (valued mammal)

Pull request description:

  All `Wallet` constructors are modified to require a change descriptor, where previously it was optional. Additionally we enforce uniqueness of the change descriptor to avoid ambiguity when deriving scripts and ensure the wallet will always have two distinct keystores.

  Notable changes

  * Add error `DescriptorError::ExternalAndInternalAreTheSame`
  * Remove error `CreateTxError::ChangePolicyDescriptor`
  * No longer rely on `map_keychain`

  fixes #1383

  ### Notes to the reviewers

  ### Changelog notice

  Changed:

  Constructing a Wallet now requires two distinct descriptors.

  ### 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:
  notmandatory:
    re-ACK 8bc3d35f6c83d078551c4bc57f72f13324865486

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