Add logging to display task details in `hf_submission_api.py` during agent execution

src/gaia_solving_agent/hf_submission_api.py

@@ -109,6 +109,8 @@ async def run_agent(agent, questions_data, additional_files):
     for item in questions_data:
         task_id = item.get("task_id")
         question_text = item.get("question")
+        print(f"Running agent on task {task_id}:\n{question_text}")
+        print("-"*30)
 
         additional_file_path, additional_file = None, None
         if item.get("file_name"):