29c8a00b435bdf2fa1d7c707ad09c1a47edc07b3 chore(wallet): remove duplicated InsufficientFunds error member from CreateTxError (e1a0a0ea)
Pull request description:
closes#1440
### Description
- Replace `CreateTxError::InsufficientFunds` use by `coin_selection::Error::InsufficientFunds`
- Remove `InsufficientFunds` member from `CreateTxError` enum
- Rename `coin_selection::Error` to `coin_selection::CoinSelectionError`
### Notes to the reviewers
- We could also keep both members but rename one of them to avoid confusion
### 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 29c8a00b435bdf2fa1d7c707ad09c1a47edc07b3
notmandatory:
ACK 29c8a00b435bdf2fa1d7c707ad09c1a47edc07b3
Tree-SHA512: a1132d09929f99f0a5e82d3ccfaa85695ae50d7d4d5d9e8fd9ef847313918ed8c7a01005f45483fef6aeae36730a0da2fed9a9f10c3ce2f0a679527caf798bfe
b4a847f801