feat: 1. replace black with ruff for fomatting and sort import (#489)

2. use tavily from`langchain-tavily` rather than the older one from `langchain-community`

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

tests/unit/tools/test_tavily_search_api_wrapper.py

@@ -1,16 +1,17 @@
 # Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
 # SPDX-License-Identifier: MIT
 import json
+from unittest.mock import AsyncMock, MagicMock, Mock, patch
+
 import pytest
-from unittest.mock import Mock, patch, AsyncMock, MagicMock
 import requests
+
 from src.tools.tavily_search.tavily_search_api_wrapper import (
     EnhancedTavilySearchAPIWrapper,
 )
 
 
 class TestEnhancedTavilySearchAPIWrapper:
-
     @pytest.fixture
     def wrapper(self):
         with patch(