code: def register_next_step_handler_by_chat_id(self, chat_id, callback, *args, **kwargs):
          
          if chat_id in self.next_step_handlers.keys():
              self.next_step_handlers[chat_id].append(Handler(callback, *args, **kwargs))
          else:
              self.next_step_handlers[chat_id] = [Handler(callback, *args, **kwargs)]
  
          if self.next_step_saver is not None:
              self.next_step_saver.start_save_timer()
docs: Registers a callback function to be notified when new message arrives after `message`.
  
          Warning: In case `callback` as lambda function, saving next step handlers will not work.
  
          :param chat_id:     The chat for which we want to handle new message.
          :param callback:    The callback function which next new message arrives.
          :param args:        Args to pass in callback func
          :param kwargs:      Args to pass in callback func