message: Add onClose reason callback when server actively close
diff: @@ -510,6 +510,8 @@ static PHP_METHOD(swoole_websocket_server, disconnect)
  // Server close connection immedialty
  conn->websocket_status = WEBSOCKET_STATUS_CLOSING;
  conn->websocket_close_code = code;
  + memcpy(conn->websocket_close_reason, data, length);
  + conn->websocket_close_reason[length] = '\0';
  SW_CHECK_RETURN(SwooleG.serv->close(serv, (int)fd, (int)SW_FALSE));
  }
  }
  