code: public static AVIMMessageIntervalBound createBound(String messageId, long timestamp, boolean closed) {
      return new AVIMMessageIntervalBound(messageId, timestamp, closed);
    }
docs: create query bound
  @param messageId - message id
  @param timestamp - message timestamp
  @param closed    - included specified message flag.
  true: include
  false: not include.
  @return  query interval bound instance