SkuName type 
定义 SkuName 的值。 
              KnownSkuName 可与 SkuName 互换使用,此枚举包含服务支持的已知值。
服务支持的已知值
              Standard_LRS 
              Standard_GRS 
              Standard_RAGRS 
              Standard_ZRS 
              Premium_LRS 
              Premium_ZRS 
              Standard_GZRS 
              Standard_RAGZRS 
              StandardV2_LRS 
              StandardV2_GRS 
              StandardV2_ZRS 
              StandardV2_GZRS 
              PremiumV2_LRS 
              PremiumV2_ZRS
type SkuName = string