支持多注册中心

[zhaoyunxing92]

What would you like to be added: 如下面配置，希望可以同时将服务注册到两个注册中心，最好有权重能力、用户也可以自定义那些接口注册到对应注册中心

dubbo:
  registries:
    shanghai:
      address: nacos://localhost:8848
      timeout: 30s
      group: shanghai
      weight: 100
    hangzhou:
      address: nacos://localhost:8848
      timeout: 30s
      group: hangzhou
      weight: 30
  provider:
    services:
      UserService:
        interface: search_placeholder.Model
        group: search
        version: 1.0.0
      OrderService:
        interface: model_service.Service
        group: search
        version: 1.0.0

Why is this needed:

[zhaoyunxing92]

@鲁易