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Merge bitcoindevkit/bdk#1093: fix: spks_of_all_keychains() shouldn't return an infinite iterator for non-wildcard descriptors

<a class=hub.com/bitcoindevkit/bdk/commit/e48b911c8d23cceab2071cc92085fe6675d55ca9">e48b911c8<a href="https://github.com/bitcoindevkit/bdk/commit/2867e88b64b4a8cf7136cc562ec61c077737a087"> refactor: Make test errors more readable (Daniela Brozzoni)
<a class="double-link" href="https://github.com/bitcoindevkit/bdk/commit/a7a1d9b2fb9fda4d86fe17cf90d9c0d46c4d8609">a7a1d9b2f</a><a href="https://github.com/bitcoindevkit/bdk/commit/2867e88b64b4a8cf7136cc562ec61c077737a087"> fix: non-wildcard descriptors should return an.. ..spk only if index is equal to 0 (Daniela Brozzoni)
</a><a class="double-link" href="https://github.com/bitcoindevkit/bdk/commit/cc1a43c495639f0dbe6da52501cb48f17b8cbbd2">cc1a43c49</a> fix: SpkIterator::new_with_range takes wildcards.. ..into account (Daniela Brozzoni)

Pull request description:

  ### Description

  When you pass a non-wildcard descriptor in `new_with_range`, we make
  sure that the range length is at most 1; if that's not the case, we
  shorten it.
  We would previously use `new_with_range` without this check and with a
  non-wildcard descriptor in `spks_of_all_keychains`, this meant creating
  a spkiterator that would go on producing the same spks over and over
  again, causing some issues with syncing on electrum/esplora.

  To reproduce the bug, run in `example-crates/example_electrum`:
  ```
  cargo run "sh(wsh(or_d(c:pk_k(cPGudvRLDSgeV4hH9NUofLvYxYBSRjju3cpiXmBg9K8G9k1ikCMp),c:pk_k(cSBSBHRrzqSXFmrBhLkZMzQB9q4P9MnAq92v8d9a5UveBc9sLX32))))#zp9pcfs9" scan
  ```

  ### Changelog notice

  - Fixed a bug where `KeychainTxOutIndex::spks_of_all_keychains`/`KeychainTxOutIndex::spks_of_keychain` would return an iterator yielding infinite spks even for non-wildcard 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:
  evanlinjin:
    ACK e48b911c8d23cceab2071cc92085fe6675d55ca9

Tree-SHA512: 87627505003696a7db7812fc5b0b523f8cf

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