Merge bitcoindevkit/bdk#1463: No descriptor ids in spk txout index

Merge bitcoindevkit/bdk#1463: No descriptor ids in spk txout index

8dd174479f9719309663ed979a5b4b86aca0a6e9 refactor(chain): compute txid once for `KeychainTxOutIndex::index_tx` (志宇)
639d735ca0ae54d8b2c3bc28241032154b94d45e refactor(chain): change field names to be more sane (志宇)
5a02f40122f1bfa06c80bac93f68f5799225d133 docs(chain): fix docs (志宇)
c77e12bae7f465ec7fb08b8be16d99793c757cf0 refactor(chain): `KeychainTxOutIndex` use `HashMap` for fields (志宇)
4d3846abf4f59b4a97bb825281655a6b67275603 chore(chain): s/replenish_lookahead/replenish_inner_index/ (LLFourn)
8779afdb0bf4e9b1004f47f86a770d25938d206d chore(chain): document insert_descriptor invariants better (LLFourn)
69f2a695f7dc25478489080598fea0813ea7d93d refactor(chain): improve replenish lookeahd internals (LLFourn)
5a584d0fd8c138757a10c7af93ec9e09523317e1 chore(chain): Fix Indexed and KeychainIndexed documentaion (Lloyd Fournier)
b8ba5a02066fad7ab2ce276ba071385cd1dbbe3a chore(chain): Improve documentation of keychain::ChangeSet (LLFourn)
101a09a97fa5e8d675c13396b9a800665b1b6c22 chore(chain): Standardise KeychainTxOutIndex return types (LLFourn)
bce070b1d662db7ac120e1d236fdda51842ad738 chore(chain): add type IndexSpk, fix clippy type complexity warning (Steve Myers)
4d2442c37f5c1bd822795271a79676d1ffbe7916 chore(chain): misc docs and insert_descriptor fixes (LLFourn)
bc2a8be97919f0d09b61438527bda24796bcec94 refactor(keychain): Fix KeychainTxOutIndex range queries (LLFourn)
3b2ff0cc953204c9925ace8e2f0bbef409c63ad5 Write failing test for keychain range querying (LLFourn)

Pull request description:

  Fixes #1459

  This reverts part of the changes in #1203. There the `SpkTxOutIndex<(K,u32)>` was changed to `SpkTxOutIndex<(DescriptorId, u32>)`. This led to a complicated translation logic in  `KeychainTxOutIndex` (where the API is based on `K`) to transform calls to it to calls to the underlying `SpkTxOutIndex` (which now indexes by `DescriptorId`). The translation layer was broken when it came to translating range queries from the `KeychainTxOutIndex`. My solution was just to revert this part of the change and remove the need for a translation layer (almost) altogether. A thin translation layer remains to ensure that un-revealed spks are filtered out before being returned from the `KeychainTxOutIndex` methods.

  I feel like this PR could be extended to include a bunch of ergonomics improvements that are easier to implement now. But I think that's the point of https://github.com/bitcoindevkit/bdk/pull/1451 so I held off and should probably go and scope creep that one instead.

  ### 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

  #### Bugfixes:

  * [x] This pull request breaks the existing API
  * [x] 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:
  evanlinjin:
    ACK 8dd174479f9719309663ed979a5b4b86aca0a6e9

Tree-SHA512: 283e6b6d4218902298e2e848fe847a6c85e27af4eee3e4337e3dad6eacf9beaa08ac99b1dce7b6fb199ca53931e543ea365728a81c41567a2e510cce77b12ac0