feat(hwi): add hardware wallet support

[tvpeter]

Description

fixes #194

Notes to the reviewers

• enable offline signer for creating tx whenever hwi feature is enabled
• make handle_offline_wallet_subcommand fn async to handle hwi operations
• The display_address method in the provided trait in async-hwi library is meant to trigger address generation by the connected device and display it on the device screen. Generated addresses are the same for both the app and device, so app addresses are returned for the hwi address subcommand.

This feature was tested with SpecterSimulator and Coldcard, although not all hwi features were successfully tested on coldcard.

For signing with hwi, it does sign but do not finalized the PSBT, so it has to be finalized before broadcasting.

Changelog notice

Checklists

HWI Wallet Subcommands implementation

• hwi devices
• hwi register
• hwi address
• hwi sign tx

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• 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

Bugfixes:

• This pull request breaks the existing API
• I've added tests to reproduce the issue which are now passing
• I'm linking the issue being fixed by this PR