Start to port main gut of the foundation

Toolkit.Foundation/Lifecycles/AppService.cs

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+using CommunityToolkit.Mvvm.Messaging;
+using Microsoft.Extensions.Hosting;
+
+namespace Toolkit.Foundation
+{
+    public class AppService : IHostedService
+    {
+        private readonly IMessenger messenger;
+        private readonly IInitialization initialization;
+
+        public AppService(IMessenger messenger,
+            IInitialization initialization)
+        {
+            this.messenger = messenger;
+            this.initialization = initialization;
+        }
+
+        public async Task StartAsync(CancellationToken cancellationToken)
+        {
+            messenger.Send(new Initialize());
+            await initialization.InitializeAsync();
+        }
+
+        public Task StopAsync(CancellationToken cancellationToken)
+        {
+            return Task.CompletedTask;
+        }
+    }
+}

Toolkit.Foundation/Lifecycles/ICache.cs

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+namespace Toolkit.Foundation
+{
+    public interface ICache
+    {
+
+    }
+}

Toolkit.Foundation/Lifecycles/IInitialization.cs

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+namespace Toolkit.Foundation
+{
+    public interface IInitialization
+    {
+        Task InitializeAsync();
+    }
+}

Toolkit.Foundation/Lifecycles/IInitializer.cs

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+namespace Toolkit.Foundation
+{
+    public interface IInitializer
+    {
+        Task InitializeAsync();
+    }
+}

Toolkit.Foundation/Lifecycles/Initialization.cs

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+namespace Toolkit.Foundation
+{
+    public class Initialization : IInitialization
+    {
+        private readonly Func<IEnumerable<IInitializer?>> factory;
+
+        public Initialization(Func<IEnumerable<IInitializer?>> factory)
+        {
+            this.factory = factory;
+        }
+
+        public async Task InitializeAsync()
+        {
+            foreach (IInitializer? initializer in factory())
+            {
+                if (initializer is not null)
+                {
+                    await initializer.InitializeAsync();
+                }
+            }
+        }
+    }
+}

Toolkit.Foundation/Lifecycles/Initialize.cs

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+namespace Toolkit.Foundation
+{
+    public record class Initialize;
+}