Shady nagy/remove newton soft (#436)

* replace NewtonSoft with System.Text.Json

* not use auth for brande and types and use GetFromJsonAsync

* fix

* fix

* Auth HttpGet more simple.

* Put, Delete and Post  more simple.

* Fixed Edit for remove image and keep image and change other fields.
Added description required in Blazor Admin.

* Removed using not used

* Refactor AuthService and introduce HttpService. add validation for price.

* return null in HttpService if not success.

* Limt Price to 1000 mximum

* DI for Blazor Services

* one blazor service.

* fix

src/BlazorAdmin/JavaScript/JSInteropConstants.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-
-namespace BlazorAdmin.JavaScript
+namespace BlazorAdmin.JavaScript
 {
     public static class JSInteropConstants
     {