业务端订阅服务变化事件时可以获取到变化的实际内容

[llm163520]

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业务端订阅服务上下线变化时，可以获取到变化的实际内容
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示例业务代码

public class NacosEventListener implements EventListener {
    @Override
    public void onEvent(Event event) {
		if (event instanceof NamingEvent namingEvent) {
			log.info("InstancesChangeEvent\r\n{}(LiveHosts: {}, NewHosts: {}, RemvHosts: {}, ModHosts: {}) => {}",
				namingEvent.getServiceName(),
				namingEvent.getInstances().size(),
				namingEvent.getNewHosts().size(),
				namingEvent.getRemvHosts().size(),
				namingEvent.getModHosts().size(),
				JSON.toJSONString(event));
		}
    }
}

[KomachiSion]

has finish in #10374.

plan to release in 2.4.0