Add load_tools() method

tools/tools.py

@@ -13,4 +13,5 @@ web_search = DuckDuckGoSearchTool()
 #image_generation_tool = load_tool("agents-course/text-to-image", trust_remote_code=True)
 
 # Define all tools
-tools = [final_answer, polite_guard, web_search, get_the_current_time_in_timezone]
+def load_tools():
+    return [final_answer, polite_guard, web_search, get_the_current_time_in_timezone]