apache / apache/servicecomb-java-chassis

[QUESTION] - 2.x升级3.x适配方案

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Description

### Steps to reproduce (if applicable)

问题1:
2.x中可以通过以下代码获取指定appid,serviceName的实例集合
````
MicroserviceVersionRule microService = DiscoveryManager.INSTANCE.getAppManager().getOrCreateMicroserviceVersionRule(
appId, serviceName, SERVICE_VERSION_RULE);
Map instanceMap = microService.getInstances();
````

3.x中api变化,应该怎么替换实现相同的功能
通过serviceCenterClient获取所有的微服务,然后再过滤,是否可行?或者有没有更好的平替方法?
```
ServiceCenterClient serviceCenterClient = BeanUtils.getBean(ServiceCenterClient.class);
List microserviceList = serviceCenterClient.getMicroserviceList().getServices();
```

问题2:2.x中PolicyRuleItem可以通过getMatch().match()判断某个请求头的值是否符合正则,3.x中要怎么替换适配?
问题3:2.x中MicroserviceCache.getInstance().getService()的替换方案

### What have you tried so far?

_No response_

### Additional context

_No response_

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