chore: enable developer tools in debug mode and update diagnostics package references.

demo/Semi.Avalonia.Demo/App.axaml.cs

@@ -12,6 +12,9 @@ public partial class App : Application
     public override void Initialize()
     {
         AvaloniaXamlLoader.Load(this);
+#if DEBUG
+        this.AttachDeveloperTools();
+#endif
         this.DataContext = new ApplicationViewModel();
     }