feat: optimize error logging (#808)

api/core/callback_handler/agent_loop_gather_callback_handler.py

     def on_llm_error(
         self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
     ) -> None:
-        logging.error(error)
+        logging.exception(error)
         self._agent_loops = []
         self._current_loop = None
         self._message_agent_thought = None
         self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
     ) -> None:
         """Do nothing."""
-        logging.error(error)
+        logging.exception(error)
         self._agent_loops = []
         self._current_loop = None
         self._message_agent_thought = None

api/core/callback_handler/dataset_tool_callback_handler.py

         self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
     ) -> None:
         """Do nothing."""
-        logging.error(error)
+        logging.exception(error)

api/core/callback_handler/llm_callback_handler.py

                 )
                 self.conversation_message_task.save_message(llm_message=self.llm_message, by_stopped=True)
         else:
-            logging.error(error)
+            logging.exception(error)

api/core/callback_handler/main_chain_gather_callback_handler.py

     def on_chain_error(
         self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
     ) -> None:
-        logging.error(error)
-        self.clear_chain_results()
+        logging.exception(error)
+        self.clear_chain_results()

api/core/indexing_runner.py

                 qa_documents.append(qa_document)
             format_documents.extend(qa_documents)
         except Exception as e:
-            logging.error(str(e))
+            logging.exception(e)
 
         all_qa_documents.extend(format_documents)