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_search.py

@@ -2,14 +2,15 @@
 # SPDX-License-Identifier: MIT
 
 import os
-import pytest
 from unittest.mock import patch
-from src.tools.search import get_web_search_tool
+
+import pytest
+
 from src.config import SearchEngine
+from src.tools.search import get_web_search_tool
 
 
 class TestGetWebSearchTool:
-
     @patch("src.tools.search.SELECTED_SEARCH_ENGINE", SearchEngine.TAVILY.value)
     def test_get_web_search_tool_tavily(self):
         tool = get_web_search_tool(max_search_results=5)