v0.22.0

Release 0.22.0

# Summary

This release brings support for hardware signers on desktop through the HWI library.

It also includes fixes and improvements which are part of our ongoing effort of integrating
BDK and LDK together.

# Changelog

## Added

- Functions to create FeeRate from sats/kvbytes and sats/kwu. #678
- Custom hardware wallet signer HwiSigner in wallet::hardwaresigner module. #682
- Function allow_dust on TxBuilder. #689
- Implementation of Deref<Target=UrlClient> for EsploraBlockchain. #722
- Implementation of Deref<Target=Client> for ElectrumBlockchain #705
- Implementation of Deref<Target=Client> for RpcBlockchain. #731

## Changed

- FeeRate function name as_sat_vb to as_sat_per_vb. #678
- Verify signatures after signing. #718
- Dependency electrum-client to 0.11.0. #737
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