feat: add `HWISigner`, moved from `bdk_hwi`#104

notmandatory merged 2 commits intobitcoindevkit:masterbitcoindevkit/rust-hwi:masterfrom

oleonardolima:feat/add-hwi-signer-from-bdk-hwioleonardolima/rust-hwi:feat/add-hwi-signer-from-bdk-hwiCopy head branch name to clipboard