fix(mcp): support to raise the exception on MCP disconnection (#1024)

---------

Co-authored-by: DavdGao <[email protected]>

Author: MengsD

src/agentscope/mcp/_stateful_client_base.py

@@ -69,9 +69,14 @@ async def connect(self) -> None:
             self.stack = None
             raise
 
-    async def close(self) -> None:
+    async def close(self, ignore_errors: bool = True) -> None:
         """Clean up the MCP client resources. You must call this method when
-        your application is done."""
+        your application is done.
+
+        Args:
+            ignore_errors (`bool`):
+                Whether to ignore errors during cleanup. Defaults to `True`.
+        """
         if not self.is_connected:
             raise RuntimeError(
                 "The MCP server is not connected. Call connect() before "
@@ -80,8 +85,9 @@ async def close(self) -> None:
 
         try:
             await self.stack.aclose()
-            logger.info("MCP client closed.")
         except Exception as e:
+            if not ignore_errors:
+                raise e
             logger.warning("Error during MCP client cleanup: %s", e)
         finally:
             self.stack = None