def messages(channel_id: nil, channel_name: nil, channel: nil)
      channel_id = channel if channel
      messages_service.messages(channel_id: channel_id, channel_name: channel_name)
    end
def messages(channel_id: nil, channel_name: nil, channel: nil)
      channel_id = channel if channel
      messages_service.messages(channel_id: channel_id, channel_name: channel_name)
    end
fetch messages

 @param channel_id [String] channel id
 @param channel_name [String] channel name
 @param channel [String] DEPRECATED!
 @note At least, one of channel_id and channel_name is required.
  If both of id and name are set, channel_id will be used.
 @return [Array[Komonjo::Model::Message]]