code: public String get(String events, String defaultValue) {
          return get(parseEvents(events), defaultValue);
      }
docs: Returns a space separated list of component IDs of components registered for at least one the `events`.
  
  @param events a comma/space separated list of event names
  @param defaultValue will be returned if no component is registered for one of the `events`
  @return a space separated list of fully qualified component IDs or `defaultValue`