Included globalusing to Devspaces.Support project

src/BuildingBlocks/Devspaces.Support/GlobalUsings.cs

@@ -0,0 +1,6 @@
+global using Microsoft.AspNetCore.Http;
+global using Microsoft.Extensions.DependencyInjection;
+global using System.Collections.Generic;
+global using System.Net.Http;
+global using System.Threading.Tasks;
+global using System.Threading;