Merge bitcoindevkit/bdk#1746: deps(esplora): bump `esplora-client` to 0.11.0

90fd1a2715c08600cb894ee83717cac5522f4334 docs(esplora): update README.md (valued mammal)
f0e6395d7f39346df497c51ef7df645dbe5e9fd3 deps(esplora): bump `esplora-client` to 0.11.0 (valued mammal)

Pull request description:

  Update `bdk_esplora` to depend on esplora-client 0.11.0

  ### Notes to the reviewers

  bitcoindevkit/rust-esplora-client#103 added a generic type parameter to `AsyncClient` representing a user-defined `Sleeper` and that change is reflected here in order to call the underlying API methods. We also add a new build feature "tokio" that enables the corresponding feature in rust-esplora-client.

  closes #1742

  ### Changelog notice

  `bdk_esplora`: Bump `esplora-client` to 0.11.0

  ### 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
  * [x] This pull request breaks the existing API
  * [x] I'm linking the issue being fixed by this PR

ACKs for top commit:
  notmandatory:
    tACK 90fd1a2715c08600cb894ee83717cac5522f4334
  oleonardolima:
    ACK 90fd1a2715c08600cb894ee83717cac5522f4334

Tree-SHA512: 98d529d3bb0dbbf4bbafeea7d30ec5e5816ac9800ba2cb7981fc6189b4b02774956c3ddbb74bf0b3e6e22798bfced36508263e4e89c248b7a6240c5c7109107b