consensus: add remaining checks trace counter to tx verifier

zebra-consensus/src/transaction.rs

@@ -219,6 +219,7 @@ where
                     // Finally, wait for all asynchronous checks to complete
                     // successfully, or fail verification if they error.
                     while let Some(check) = async_checks.next().await {
+                        tracing::trace!(?check, remaining = async_checks.len());
                         check?;
                     }