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/config/test_configuration.py

@@ -3,6 +3,7 @@
 
 import sys
 import types
+
 from src.config.configuration import Configuration
 
 # Patch sys.path so relative import works

tests/unit/config/test_loader.py

@@ -3,6 +3,7 @@
 
 import os
 import tempfile
+
 from src.config.loader import load_yaml_config, process_dict, replace_env_vars