Implemented better ux for the oauth2 workflow

Still wip

Moonlight.Client/Services/WindowService.cs

@@ -0,0 +1,19 @@
+using Microsoft.JSInterop;
+
+namespace Moonlight.Client.Services;
+
+public class WindowService
+{
+    private readonly IJSRuntime JsRuntime;
+
+    public WindowService(IJSRuntime jsRuntime)
+    {
+        JsRuntime = jsRuntime;
+    }
+
+    public async Task Open(string url, string title, int height, int width)
+     => await JsRuntime.InvokeVoidAsync("moonlight.window.open", url, title, height, width);
+
+    public async Task Close()
+        => await JsRuntime.InvokeVoidAsync("moonlight.window.closeCurrent");
+}