code: def connect(self, args=None, **kwargs):
      api_token = self.connection_args[self.key]
      notion = Client(auth=api_token)
      self.is_connected = True
      return notion
  
file_path: mindsdb/mindsdb/integrations/handlers/notion_handler/notion_handler.py
imports: import time
  import pandas
  from collections import defaultdict
  from notion_client import Client
  from mindsdb.utilities import log
  from mindsdb.integrations.libs.api_handler import APIHandler
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse, RESPONSE_TYPE
  from .notion_table import NotionBlocksTable, NotionCommentsTable, NotionDatabaseTable, NotionPagesTable
label_desc: Use image node_id 2 for calling the NotionHandler obj's underlying member method code with example usage: obj.connect(args) and returns: notion