Reorganize, shared entities from TypeScript SDK

https://github.com/cloudflare/cloudflare-typescript/blob/v4.4.1/src/resources/shared.ts

Cloudflare/Auth/ApiKeyAuthentication.cs

@@ -1,7 +1,6 @@
-using System;
-using System.Net.Http;
+using System.Net.Http;
 
-namespace AMWD.Net.Api.Cloudflare.Auth
+namespace AMWD.Net.Api.Cloudflare
 {
 	/// <summary>
 	/// Implements the interface to authenticate using an API key and email address.