docstr: TODO: integrate code for disconnecting from slack
docstr_tok: ["TODO",":","integrate","code","for","disconnecting","from","slack"]
code: def disconnect(self):
      """
      TODO: integrate code for disconnecting from slack
      """
      raise NotImplementedError()
  
file_path: evadb/evadb/third_party/databases/slack/slack_handler.py
imports: import pandas
  from slack_sdk import WebClient
  from slack_sdk.errors import SlackApiError
  from evadb.third_party.types import DBHandler, DBHandlerResponse, DBHandlerStatus
label_desc: Use image node_id 3 for calling the SlackHandler obj's underlying member method code with example usage: obj.disconnect() without return types