Put types of background event on separate lines

Author: cadonna

clients/src/main/java/org/apache/kafka/clients/consumer/internals/events/BackgroundEvent.java

@@ -27,8 +27,11 @@
 public abstract class BackgroundEvent {
 
     public enum Type {
-        ERROR, CONSUMER_REBALANCE_LISTENER_CALLBACK_NEEDED, SHARE_ACKNOWLEDGEMENT_COMMIT_CALLBACK,
-        STREAMS_ON_TASKS_ASSIGNED_CALLBACK_NEEDED, STREAMS_ON_TASKS_REVOKED_CALLBACK_NEEDED,
+        ERROR,
+        CONSUMER_REBALANCE_LISTENER_CALLBACK_NEEDED,
+        SHARE_ACKNOWLEDGEMENT_COMMIT_CALLBACK,
+        STREAMS_ON_TASKS_ASSIGNED_CALLBACK_NEEDED,
+        STREAMS_ON_TASKS_REVOKED_CALLBACK_NEEDED,
         STREAMS_ON_ALL_TASKS_LOST_CALLBACK_NEEDED
     }