Merge bitcoindevkit/bdk#471: moving the function wallet_name_from_descriptor from...

Merge bitcoindevkit/bdk#471: moving the function wallet_name_from_descriptor from blockchain/rpc.rs to wallet/mod.rs as it can be useful not only for rpc

2fc81141806ace8f12e5a019c0866f16fa8a02dc moving the function wallet_name_from_descriptor from blockchain/rpc.rs to wallet/mod.rs as it can be useful not only for rpc (Richard Ulrich)

Pull request description:

  ### Description

  Moving the function wallet_name_from_descriptor from rpc.rs to mod.rs
  Since the local cache for compact filters should be separate per wallet, this function can be useful not only for rpc.

  ### Notes to the reviewers

  I thought about renaming it, but waited for opinions on that.

  ### 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:
  notmandatory:
    re-ACK  2fc8114

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