refactor(hwi,wallet): enhance hardware wallet integration and testing

[pluveto]

Overview

This PR introduces enhancements to the hardware wallet integration within the hwi crate and improves the testing utilities in the wallet crate.

Changes

1. Enabling test-util Feature
   The bdk_wallet dependency in the hwi crate now includes the test-util feature, allowing the use of additional testing utilities provided by the bdk_wallet crate.
2. refining TransactionSigner implementation
3. Re-enabling and updating hardware wallet signer test
   The previously disabled hardware wallet signer test has been re-enabled and updated to use the test-util feature. This includes improvements to the test structure and error handling, ensuring robust and comprehensive testing.
4. Move common test functions as test-util inside wallet crate
   A new test-util module has been added to the wallet crate to organize and provide utilities for testing. This promotes code reuse and maintainability across different tests.

[evanlinjin]

Thanks for this PR. I haven't had the opportunity to review this properly yet, however I am wondering if there is a particular reason why bdk_wallet is not a dev-dependency?

[evanlinjin]

Also, can you please remove the merge commit and do a rebase instead? Thank you

[pluveto]

OK.

insert_tx has been refactor in 324eeb3. I need to reorganize the code.

[pluveto]

Reorganized and moved bdk_wallet with test-util feature flag into dev-dependency.

Ready for review. Please take a look.

[pluveto]

It seems that the HWI emulator is disabled, which caused the HWI-related tests to fail.

Therefore, I have added it (add HWI emulator setup).

[pluveto]

CI issue is fixed by specific OpenSSL config. 15d6d9a

[ValuedMammal]

I appreciate what is accomplished in this PR. I'm somewhat ambivalent toward having this change. Main concern is bringing python dependency back to CI considering the age of this emulator software and that the nano s hasn't seen a firmware update since 2021 which amounts to more of a maintenance burden than I think is warranted. Other folks might have different opinions. In any case if you decide to continue work on this branch, we'd like if you also signed commits, although for the record I realized that policy isn't well documented.

[pluveto]

Thank you for your feedback. I've updated the emulator model used for the firmware to a more recent version. Additionally, I've resubmitted the commits with signatures. Thanks!

[oleonardolima]

Thanks for working on this! However, after #1561 the HWISigner and therefore the TransactionSigner implementation has moved to rust-hwi, so I guess we could close this PR (cc @notmandatory).

Feel free to open a PR in rust-hwi with your suggested enhancements, I also think we could reuse the approach of having a test util, exposing it through bdk_testenv, and use it there at rust-hwi for testing.