[Aggregator] Added Service InterfaceClasses for Consuming Internal Mi…

…croservices

src/ApiGateways/Shopping.Aggregator/Services/IBasketService.cs

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+using Shopping.Aggregator.Models;
+
+namespace Shopping.Aggregator.Services;
+
+public interface IBasketService
+{
+    Task<BasketModel> GetBasket(string userName);
+}

src/ApiGateways/Shopping.Aggregator/Services/ICatalogService.cs

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+using Shopping.Aggregator.Models;
+
+namespace Shopping.Aggregator.Services;
+
+public interface ICatalogService
+{
+    Task<IEnumerable<CatalogModel>> GetCatalog();
+    Task<IEnumerable<CatalogModel>> GetCatalogByCategory(string category);
+    Task<CatalogModel> GetCatalog(string id);
+}

src/ApiGateways/Shopping.Aggregator/Services/IOrderService.cs

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+using Shopping.Aggregator.Models;
+
+namespace Shopping.Aggregator.Services;
+
+public interface IOrderService
+{
+    Task<IEnumerable<OrderResponseModel>> GetOrdersByUserName(string userName);
+}