Added hook option for plugins to inject into the main layout before the router

Moonlight.Frontend/Interfaces/LayoutMiddlewareBase.cs

@@ -0,0 +1,8 @@
+using Microsoft.AspNetCore.Components;
+
+namespace Moonlight.Frontend.Interfaces;
+
+public abstract class LayoutMiddlewareBase : ComponentBase
+{
+    [Parameter] public RenderFragment ChildContent { get; set; }
+}