refactor(bdk_hwi): remove bdk_hwi, as HWISigner's being moved to rust-hwi

[oleonardolima]

fixes #1516
depends on bitcoindevkit/rust-hwi#104

Description

This PR removed the bdk_hwi crate, and the dangling hardwaresigner.rs file from bdk_wallet crate.

It simplifies the BDK project workspace as it removes the dependency on rust-hwi, pyo3 and some required steps on CI.

The removal is fine, as the HWISigner is being moved to rust-hwi project instead, please check: bitcoindevkit/rust-hwi#104

Notes to the reviewers

Please let me know what you think about the removal, and if I missed anything.

Changelog notice

• Removed dangling unused hardwaresigner.rs file from bdk_wallet crate.
• Removed bdk_hwi crate, moved to rust-hwi project.

Checklists

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

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

[notmandatory]

bitcoindevkit/rust-hwi#104 is merged.

[notmandatory]

I rebased this PR and removed the hwi/Cargo.toml file which looks like it was missed.

[oleonardolima]

I rebased this PR and removed the hwi/Cargo.toml file which looks like it was missed.

Thanks! I just noticed that I forgot to remove the automation.json file used by the simulator, I removed it in cd8ddfe

[notmandatory]

ACK cd8ddfe