Swamy/remove unused usings and reorganize usings (#489)

* Removed and Reordered the using statements

* Removed and Reordered the usings inside Web Project

* Removed and Reordered the usings inside PublicApi project

* Removed Unused usings and reorganized usings inside Infrastructure project

src/Web/Controllers/OrderController.cs

@@ -1,5 +1,4 @@
 using MediatR;
-using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.eShopWeb.Web.Features.MyOrders;