Peter Tyonum

refactor: move `tx_template` from `bdk_chain` to `bdk_testenv`

1

### Description This PR implements the following changes: - moves `TxTemplate` from `crates/chain/tests/common/mod.rs` to `testenv`. - refactors `init_graph` function and `TxTemplate` struct to use `Cow` - redoes the canonical benchmark...

feat(hwi): add hardware wallet support

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### 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...

Add saving wallet config with `bdk-cli wallet config`

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### Description This PR adds `bdk-cli wallet config` command to save wallet configuration information to `config.toml` file in the data directory. Fixes #192 ### Notes to the reviewers - Reusing...

NUMS_UNSPENDABLE_KEY_HEX is not supposed to be used as is (privacy concerns)

3

I believe technically the `NUMS_UNSPENDABLE_KEY_HEX` is not supposed to be used as is (privacy concerns), though for now it's fine. Per [BIP-0431](https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki#constructing-and-spending-taproot-outputs), should add an issue to do the following:...