Initialization rework

Toolkit.Foundation/Lifecycles/InitializationHandler.cs

@@ -0,0 +1,27 @@
+using Mediator;
+
+namespace Toolkit.Foundation
+{
+    public class InitializationHandler : IRequestHandler<Initialization>
+    {
+        private readonly IEnumerable<IInitializer?> initializers;
+
+        public InitializationHandler(IEnumerable<IInitializer?> initializers)
+        {
+            this.initializers = initializers;
+        }
+
+        public async ValueTask<Unit> Handle(Initialization request, CancellationToken cancellationToken)
+        {
+            foreach (IInitializer? initializer in initializers)
+            {
+                if (initializer is not null)
+                {
+                    await initializer.InitializeAsync();
+                }
+            }
+
+            return default;
+        }
+    }
+}