Refactor project structure and add initial files

aspire-sample/aspire-sample.Web/Components/_Imports.razor

@@ -0,0 +1,11 @@
+@using System.Net.Http
+@using System.Net.Http.Json
+@using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Routing
+@using Microsoft.AspNetCore.Components.Web
+@using static Microsoft.AspNetCore.Components.Web.RenderMode
+@using Microsoft.AspNetCore.Components.Web.Virtualization
+@using Microsoft.AspNetCore.OutputCaching
+@using Microsoft.JSInterop
+@using aspire_sample.Web
+@using aspire_sample.Web.Components