@Override
    public String named() {
        return PluginEnum.DUBBO.getName();
    }
acquire plugin name.
this is plugin name define you must Provide the right name.
if you impl AbstractShenyuPlugin this attribute not use.

@return plugin name.
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-dubbo/shenyu-plugin-dubbo-common/src/main/java/org/apache/shenyu/plugin/dubbo/common/AbstractDubboPlugin.java