initial changes to migrate to new Blazor approach in .NET 8

Oqtane.Client/Utilities/RenderModes.cs

@@ -0,0 +1,22 @@
+using Microsoft.AspNetCore.Components.Web;
+using Microsoft.AspNetCore.Components;
+
+namespace Oqtane.Client.Utilities
+{
+    public static class RenderModes
+    {
+        public static IComponentRenderMode GetRenderMode(string renderMode)
+        {
+            switch (renderMode)
+            {
+                case "InteractiveServer":
+                    return RenderMode.InteractiveServer;
+                case "InteractiveWebAssembly":
+                    return RenderMode.InteractiveWebAssembly;
+                case "InteractiveAuto":
+                    return RenderMode.InteractiveAuto;
+            }
+            return null;
+        }
+    }
+}