Merge bitcoindevkit/bdk-cli#77: Fetch address index in verbose mode for get_new_address

Merge bitcoindevkit/bdk-cli#77: Fetch address index in verbose mode for get_new_address

73a9824b79d75d9e394cdbb8f9c9ab00e3bca788 Fetch address index in verbose mode for get_new_address (rajarshimaitra)

Pull request description:

  <!-- You can erase any parts of this template not applicable to your Pull Request. -->

  ### Description

  Fixes #40

  cc @thunderbiscuit

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk-cli/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
  * [ ] I've updated `CHANGELOG.md`

ACKs for top commit:
  thunderbiscuit:
    tested ACK [73a9824](https://github.com/bitcoindevkit/bdk-cli/pull/77/commits/73a9824b79d75d9e394cdbb8f9c9ab00e3bca788).
  notmandatory:
    ACK 73a9824b79d75d9e394cdbb8f9c9ab00e3bca788

Tree-SHA512: 643898e312061d6c405ee7a1065987a1c308fb4ae18ed52f3945e2411dd4001c951322fcc2f12fcb195e939e14df26703f8ae97b793aa8955de02cf39b2f96b1