Add foundation

Toolkit.Foundation/NavigateHandler.cs

@@ -0,0 +1,21 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Toolkit.Foundation;
+
+public class NavigateHandler(IComponentScopeProvider provider) :
+    INotificationHandler<Navigate>
+{
+    public async Task Handle(Navigate args, 
+        CancellationToken cancellationToken)
+    {
+        if (provider.Get(args.Scope ?? "Default") 
+            is IServiceProvider scope)
+        {
+            if (scope.GetService<INavigationScope>() is INavigationScope navigationScope)
+            {
+                await navigationScope.NavigateAsync(args.Route, args.Sender,
+                    args.Context, args.Navigated, args.Parameters, cancellationToken);
+            }
+        }
+    }
+}