Merge bitcoindevkit/bdk#1897: test for excluded bounds in outputs_in_range

ad792670c487e62183d901338b2655ec7b81c688 test for excluded bounds in outputs_in_range (aagbotemi)

Pull request description:

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  ### Description
  This PR covers a wide range on tests for excluded bounds and the `SpkTxOutIndex::outputs_in_range`. This PR fixes bitcoindevkit/bdk_wallet#58

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  ### Notes to the reviewers

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  ### Changelog notice

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  ### 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
  * [ ] I've added docs for the new feature

  #### Bugfixes:

  * [ ] This pull request breaks the existing API
  * [ ] I've added tests to reproduce the issue which are now passing
  * [x] I'm linking the issue being fixed by this PR

ACKs for top commit:
  ValuedMammal:
    ACK ad792670c487e62183d901338b2655ec7b81c688
  oleonardolima:
    utACK ad792670c487e62183d901338b2655ec7b81c688

Tree-SHA512: 268e48ce6e7ffb0ed62d0124869caf1fbcff65d787a1a6566a5521408a8b9659a9f25cba5523802e805ac24bfa7809fff51e49c6be59cef6b6ecf4a29ffb9b0a