v1.0.0-alpha.4

Release 1.0.0-alpha.4

Summary

This release improves the `KeychainTxOutIndex` API and contains a few bug fixes and performance improvements.

Changelog

Fixed

- Avoid using `BTreeMap::append` due to performance issues (refer to https://github.com/rust-lang/rust/issues/34666#issuecomment-675658420). #1274

Changed

- The old `hardwaresigner` module has been moved out of `bdk` and inside a new `bdk_hwi` crate. #1161
- Wallet's peek-address logic is optimized by making use of `<SpkIterator as Iterator>::nth`. #1269
- `KeychainTxOutIndex` API is refactored to better differentiate between methods that return unbounded vs stored spks. #1269
- `KeychainTxOutIndex` no longer directly exposes `SpkTxOutIndex` methods via `DeRef`. This was problematic because `SpkTxOutIndex` also contains lookahead spks which we want to hide. #1269
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