Add more logs

Author: sakthivelmanii

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

@@ -473,6 +473,7 @@ public void run() {
             return;
           }
         }
+        System.out.println("Initiate Streaming");
         if (!initiateStreaming(AsyncResultSetImpl.this)) {
           initiateProduceRows();
         }