class_docstr: Manages interactions between agents on messenger as well as direct interactions
  between agents and the messenger overworld.
code: def _handle_bot_read(self, agent_id):
      self.sender.send_read(agent_id)
      self.sender.typing_on(agent_id)
  
imports: import logging
  import os
  from parlai.core.agents import create_agent
  import parlai.chat_service.utils.logging
  import parlai.chat_service.utils.server
  from parlai.utils.io import PathManager
  from parlai.chat_service.services.messenger.agents import MessengerAgent
  from parlai.chat_service.core.socket import ChatServiceMessageSocket
  from parlai.chat_service.services.messenger.message_sender import MessageSender
  from parlai.chat_service.core.chat_service_manager import ChatServiceManager
label_desc: Use image node_id 8 for calling the MessengerManager obj's underlying member method code with example usage: obj._handle_bot_read(agent_id) without return types