message: add faucet output as var context
diff: @@ -706,7 +706,7 @@ impl<'a> StarcoinTestAdapter<'a> {
  match output.output.status {
  TransactionStatusView::Executed => {
  self.hack_account(addr)?;
  - Ok((None, None))
  + Ok((None, Some(serde_json::to_value(&output)?)))
  }
  _ => {
  bail!(
  