@Override
    public String toString() {
        return "MotanRpcExt{"
                + "methodInfo=" + methodInfo
                + ", group='" + group + '\''
                + ", timeout='" + timeout + '\''
                + ", rpcProtocol='" + rpcProtocol + '\''
                + '}';
    }
set rpcProtocol.
@param rpcProtocol rpc protocol
shenyu-client/shenyu-client-motan/src/main/java/org/apache/shenyu/client/motan/common/dto/MotanRpcExt.java