restructure project for part 2

Hyperbar.UI.Windows/TemplateFactory.cs

@@ -0,0 +1,21 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Hyperbar.UI.Windows;
+
+public class TemplateFactory(IEnumerable<IContentTemplateDescriptor> descriptors,
+    IServiceProvider provider) :
+    ITemplateFactory
+{
+    public object? Create(object key)
+    {
+        if (descriptors.FirstOrDefault(x => x.Key == key) is IContentTemplateDescriptor descriptor)
+        {
+            if (provider.GetRequiredKeyedService(descriptor.TemplateType, descriptor.Key) is { } template)
+            {
+                return template;
+            }
+        }
+
+        return default;
+    }
+}