Merge bitcoindevkit/bdk#1990: How can we be happy if clippy is not?

Merge bitcoindevkit/bdk#1990: How can we be happy if clippy is not?

f4e158a3e415d0131a560156cf8f6bb21c98f6f7 chore(esplora): Allow `dead_code` for helper methods (志宇)
cb7a980b846685bbe38d7ff9b12d11cbf529df76 chore: Make clippy happy (志宇)
93657a0f1e3606e672204aee51dab97dd93b9404 chore: `.gitignore` Exclude criterion results (志宇)

Pull request description:

  ### Description

  I made clippy happy.

  ### Checklists

  #### All Submissions:

  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)

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Tree-SHA512: b28afe91dd5d47dfc83a4d14bc47d8efa1e5077448cbbddd1fd74a74232a120e0823d778fa007cde7cfbea52d07ee1f5e719590a56fa143ec9288efc4e56afe1