break widget related stuff into its own project as the main HB project was just becoming too bloated

Hyperbar.Widget/WidgetViewModelEnumerator.cs

@@ -0,0 +1,11 @@
+namespace Hyperbar.Widget;
+
+public class WidgetViewModelEnumerator :
+    INotificationHandler<Enumerate<IWidgetViewModel>>
+{
+    public Task Handle(Enumerate<IWidgetViewModel> notification,
+        CancellationToken cancellationToken)
+    {
+        throw new NotImplementedException();
+    }
+}