fix(spanner): Add logs

Author: sakthivelmanii

google-cloud-spanner/src/main/java/com/google/cloud/spanner/AsyncResultSetImpl.java

@@ -468,6 +468,7 @@ public void run() {
         // Those result sets will trigger initiateProduceRows() when the first results are received.
         // Non-streaming result sets do not trigger this callback, and for those result sets, we
         // need to eagerly start the ProduceRowsRunnable.
+        System.out.printf("Initiate streaming %s\n", state);
         if (!initiateStreaming(AsyncResultSetImpl.this)) {
           initiateProduceRows();
         }

google-cloud-spanner/src/test/java/com/google/cloud/spanner/RetryOnInvalidatedSessionTest.java

@@ -1573,6 +1573,7 @@ private void asyncTransactionManager_readAsync(
               context.then(
                   (transaction, ignored) -> {
                     AsyncResultSet rs = fn.apply(transaction);
+                    System.out.println("Creating a new Async Result set streaming");
                     ApiFuture<Void> fut =
                         rs.setCallback(
                             queryExecutor,