message: add consumer_num & producer_num
diff: @@ -549,12 +549,20 @@ static PHP_METHOD(swoole_channel_coro, isFull)
  static PHP_METHOD(swoole_channel_coro, stats)
  {
  + channel_coro_property *property = swoole_get_property(getThis(), CHANNEL_CORO_PROPERTY_INDEX);
  +
  swChannel *chan = swoole_get_object(getThis());
  array_init(return_value);
  + sw_add_assoc_long_ex(return_value, ZEND_STRS("consumer_num"), property->consumer_list->num);
  + sw_add_assoc_long_ex(return_value, ZEND_STRS("producer_num"), property->producer_list->num);
  +
  + if (chan == NULL)
  + {
  sw_add_assoc_long_ex(return_value, ZEND_STRS("queue_num"), chan->num);
  sw_add_assoc_long_ex(return_value, ZEND_STRS("queue_bytes"), chan->bytes);
  }
  +}
  static PHP_METHOD(swoole_channel_coro, select)
  {
  