message: Add unchecked_finalize function for the transaction builder.
diff: @@ -101,6 +101,12 @@ impl TransactionBuilder<Address> {
  balance(&self.tx, Value(0))
  }
  + /// Create transaction finalizer without performing any
  + /// checks or output balancing.
  + pub fn unchecked_finalize(mut self) -> TransactionFinalizer {
  + TransactionFinalizer::new(self.tx, self.cert)
  + }
  +
  /// We finalize the transaction by passing fee rule and return
  /// policy. Then after all calculations were made we can get
  /// the information back to us.
  