Add error log for client stdio (#924)

Co-authored-by: Your Name <youremail@yourdomain.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

src/mcp/client/stdio/__init__.py

@@ -154,6 +154,7 @@ async def stdio_client(server: StdioServerParameters, errlog: TextIO = sys.stder
                         try:
                             message = types.JSONRPCMessage.model_validate_json(line)
                         except Exception as exc:
+                            logger.exception("Failed to parse JSONRPC message from server")
                             await read_stream_writer.send(exc)
                             continue