help request:i want to build a apisix with apisix-seed(zookeeper with dubbo) ,but dubbo-proxy asked for Map response and dubbo-providers are too much.Can i use springboot+zk+dubbo in apisix-java-plugin-runner for it?

### Description

之前用的用的apisix+dubbo-proxy+apisix-seed（zookeeper+dubbo）得的结构来做dubbo转http的哇，修改apisix-seed的源代码能够获取到对应的IP和port但是配置完之后dubbo-proxy需要dubbo方添加一个使用的是MAP结构服务 ，dubbo服务方太多，未添加，导致调用响应499，未想出好的方案，故此想问一下自定义apisix-java-plugin-runner里面可以连接zk吗？从filter里面调用对应的服务进行返回数据可以吗？

### Environment

- APISIX version ([2.15](apisix:2.15.1-centos)):
- Operating system (Linux:
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
- etcd version, if relevant (run `docker.io/bitnami/etcd:3.4.16-debian-10-r14`):
- apisix-seed源码:其中为适配dubbo-proxy修改了discoverer/zookeeper.go：
// fetchService fetch service watch and send message notify
func (zd *ZookeeperDiscoverer) fetchService(serviceName string, a6conf map[string]*message.Message) error {
var service *ZookeeperService
zkService, ok := zd.zkWatchServices.Load(serviceName)
log.Info("start get service: %s ", serviceName)
if ok {
service = zkService.(*ZookeeperService)
} else {
var err error
service, err = zd.newZookeeperClient(serviceName)
if err != nil {
log.Errorf("zd.newZookeeperClient fail: %s ,err: %s ", serviceName, err)
return err
}
zd.addWatchService(service)
}
service.mutex.Lock()
for k, msg := range a6conf {
if _, ok = service.BindEntities[k]; !ok {
service.BindEntities[k] = msg
} else {
service.BindEntities[k].Version = msg.Version
}
}
service.mutex.Unlock()
var path = service.WatchPath+"/providers"
children, _, err := zd.zkConn.Children(path)
if err != nil {
log.Errorf("zd.zkConn.Children fail: %s ,err: %s ", path, err)
return err
}
var nodes []*message.Node
for _, p := range children {
tmp := path + "/" + p
fmt.Println("---first tmp: ", p)
serviceInfo, _, err := zd.zkConn.Get(tmp)
if err != nil {
fmt.Println("zd.zkConn.Get fail: %s ,err: %s ", tmp, err)
return err
}
ip :=string(serviceInfo)
if len(ip) ==0{
fmt.Println("serviceInfo is null ")
continue
}
ipStr :=ip+"%3A"
fmt.Println("----zd.zkConn.Get success:", ipStr, len(ipStr))
targetPort :=p[(strings.Index(p, ipStr)+len(ipStr)):strings.Index(p, "%2F"+service.Name)]
port, err := strconv.Atoi(targetPort)
if err != nil {
log.Errorf("strconv.Atoi fail: %s ,err: %s ", targetPort, err)
return err
}
fmt.Println(port)
dubboNode := &message.Node{
Host: ip,
Port: port,
Weight: 100,
}
nodes=append(nodes,dubboNode)
}
zd.sendMessage(service, nodes)
return nil
}