improve: introduce isort for linting Python imports (#1983)

api/core/third_party/langchain/llms/fake.py

@@ -1,9 +1,9 @@
 import time
-from typing import List, Optional, Any, Mapping
+from typing import Any, List, Mapping, Optional
 
 from langchain.callbacks.manager import CallbackManagerForLLMRun
 from langchain.chat_models.base import SimpleChatModel
-from langchain.schema import BaseMessage, ChatResult, AIMessage, ChatGeneration
+from langchain.schema import AIMessage, BaseMessage, ChatGeneration, ChatResult
 
 
 class FakeLLM(SimpleChatModel):

api/core/third_party/spark/spark_llm.py

@@ -4,12 +4,11 @@ import hashlib
 import hmac
 import json
 import queue
-from typing import Optional
-from urllib.parse import urlparse
 import ssl
 from datetime import datetime
 from time import mktime
-from urllib.parse import urlencode
+from typing import Optional
+from urllib.parse import urlencode, urlparse
 from wsgiref.handlers import format_date_time
 
 import websocket