DynamicSet: Store names of plugins who bound the items

For the items in DynamicItem and DynamicMap we are storing the name of
the plugin which has bound the item. Do the same for items in DynamicSet
so that we can provide items from DynamicSet by plugin.

Being able to get the name of the plugin that has bound the item is
useful for logging and debugging.

Change-Id: I990afdc117e18f8544ca376788ce0f35bb1c2ec5
Signed-off-by: Edwin Kempin <ekempin@google.com>

java/com/google/gerrit/acceptance/EventRecorder.java

@@ -63,6 +63,7 @@ public class EventRecorder {
 
     eventListenerRegistration =
         eventListeners.add(
+            "gerrit",
             new UserScopedEventListener() {
               @Override
               public void onEvent(Event e) {