feat(btc): report extra context in the TxBuildError

[ShookLyngs]

Changes

• Add a context prop in the TxBuildError to report more info; The TxBuilderError.context.tx (a TxBuilder object) should exist when the BTC Builder APIs fail. For example, you should be able to visit the context when calling the sendBtc API and it fails:

  try {
    await sendBtc(...);
  } catch (e) {
    if (e instanceof TxBuildError) {
      console.log(e.context.tx); // TxBuilder
    }
  }

• Update the message of the MISSING_PUBKEY error

  Missing a pubkey that pairs with the address, it is required for the P2TR UTXO included in the transaction: {address}
  

Related issues

• Resolves The MISSING_PUBKEY error is not clear enough #266
• Improves error tracing for users The INSUFFICIENT_UTXO error is not clear enough #260