初步增加存储服务直传Feature

sdks/storage/storage_feature.go

@@ -78,3 +78,13 @@ func (f *InternalServerlessCallFeature) GetFeatureType() string {
 func (f *InternalServerlessCallFeature) String() string {
 	return "InternalServerlessCall"
 }
+
+// 存储服务之间直传文件
+type S2SFeature struct {
+	serder.Metadata `union:"S2S"`
+	Type            string `json:"type"`
+}
+
+func (f *S2SFeature) GetFeatureType() string {
+	return "S2S"
+}