<!-- If you need to report a security issue please visit https://github.com/apache/dubbo/security/policy -->

- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 3.0.7
* Operating System version: all
* Java version: all

### Steps to reproduce this issue

1. 使用阿里巴巴的包实现了扩展com.alibaba.dubbo.registry.RegistryFactory,并重写了方法
org.alibaba.dubbo.registry.Registry getRegistry(com.alibaba.dubbo.common.URL url)
 
目前系统数量比较多,升级dubbo3.0.7后编译失败,查看了Dubbo3中的com.alibaba.dubbo.registry.RegistryFactory,类型发现
这个类型的getRegistry的返回值变了,返回了apache的org.apache.dubbo.registry.Registry
org.apache.dubbo.registry.Registry getRegistry(com.alibaba.dubbo.common.URL url);

如果这样搞的话,我这个依赖库中的扩展就无法同时支持新老版本的getRegistry方法了使用了高版本的包重写了getRegistry这个方法低版本的包就无法用我的扩展类型

Pls. provide [GitHub address] to reproduce this issue.

### Expected Behavior

<!-- What do you expect from the above steps？-->
麻烦兼容下低版本,其他类型做的都挺好的返回值alibaba的包下面就是alibaba的类型 

### Actual Behavior

<!-- What actually happens? -->

目前alibaba的包中出现 apache的类型 自定义扩展到 同学们的开发的工具包可能是无法兼容dubbo新版本的,导致升级困难

url.getVersion() == null ? "" : url.getVersion(),
                            url.getGroup() == null ? "" : url.getGroup(),
                            CONSUMER_SIDE,
                            applicationModel.getApplicationName()),
                        url.getParameters());
                }
            }
        } catch (Exception e) {
            
            logger.error("publish service definition metadata error.", e);
        }
    }
    public static MetadataService referProxy(ServiceInstance instance) {
        MetadataServiceURLBuilder builder;
        ExtensionLoader<MetadataServiceURLBuilder> loader = instance.getApplicationModel()
            .getExtensionLoader(MetadataServiceURLBuilder.class);
        Map<String, String> metadata = instance.getMetadata();
        
        String dubboUrlsForJson = metadata.get(METADATA_SERVICE_URLS_PROPERTY_NAME);
        if (metadata.isEmpty() || StringUtils.isEmpty(dubboUrlsForJson)) {
            builder = loader.getExtension(StandardMetadataServiceURLBuilder.NAME);
        } else {
            builder = loader.getExtension(SpringCloudMetadataServiceURLBuilder.NAME);
        }
        List<URL> urls = builder.build(instance);
        if (CollectionUtils.isEmpty(urls)) {
            throw new IllegalStateException("Introspection service discovery mode is enabled "
                    + instance + ", but no metadata service can build from it.");
        }