Multi Protocols doesn't work on Nacos

[mark4z]

Environment

• Server: Dubbo-go v3.1.1-rc1
• Client:
• Protocol: tri/dubbo
• Registry: Nacos

Issue description

nacos-go-sdkv2.0 changed the semantics of namingclient.RegisterInstance, resulting in each RegisterInstance() overwriting the entire nacos service instead of appending an Instance.

I think this is an unreasonably breaking change of nacos-go-sdk, and perhaps nacos-go-sdk rather than dubbogo should be the one to fix it.

  protocols:
    dubbo:
      name: dubbo
      port: 20000
    tri:
      name: tri
      port: 20001

// Register will register the service @url to its nacos registry center.
func (nr *nacosRegistry) Register(url *common.URL) error {
	start := time.Now()
	serviceName := getServiceName(url)
	groupName := nr.URL.GetParam(constant.NacosGroupKey, defaultGroup)
	param := createRegisterParam(url, serviceName, groupName)
	logger.Infof("[Nacos Registry] Registry instance with param = %+v", param)
	isRegistry, err := nr.namingClient.Client().RegisterInstance(param)
	metrics.Publish(metricsRegistry.NewRegisterEvent(err == nil && isRegistry, start))
	if err != nil {
		return err
	}
	if !isRegistry {
		return perrors.New("registry [" + serviceName + "] to  nacos failed")
	}
	nr.registryUrls = append(nr.registryUrls, url)
	return nil
}

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[chickenlj]

There's another API in Nacos 2.x, something like batchRegister to register all protocol instances at once. I think dubbo-go can try to support this change in Nacos 2.x.