Refactor product command handling

Introduced `CreateProduct` command and handler in `CreateProduct.cs`, replacing the removed `ProductCreated` command and its associated classes. Updated service registration in `Program.cs` to reflect this change. Modified `MessagingSample.csproj` to set `<IsPackable>false</IsPackable>`, indicating the project is not packable as a NuGet package.

samples/MediatorSample/CreateProduct.cs

@@ -0,0 +1,28 @@
+using Infinity.Toolkit.Experimental;
+using Infinity.Toolkit.Experimental.Mediator;
+
+namespace MediatorSample;
+
+internal record CreateProduct(int Id, string Name) : ICommand;
+
+internal class CreateProductHandler : IMediatorHandler<CreateProduct>
+{
+    public Task<Result> HandleAsync(MediatorHandlerContext<CreateProduct> context, CancellationToken cancellationToken = default)
+    {
+        Console.WriteLine("CreateProductHandler:HandleAsync");
+        Console.WriteLine($"Product created: {context.Request.Id} - {context.Request.Name}");
+        Console.WriteLine("CreateProductHandler:HandleAsync:Done");
+        return Task.FromResult(Result.Success());
+    }
+}
+
+internal class CreateProductDecorator(IMediatorHandler<CreateProduct> inner) : IMediatorHandler<CreateProduct>
+{
+    public async Task<Result> HandleAsync(MediatorHandlerContext<CreateProduct> context, CancellationToken cancellationToken = default)
+    {
+        Console.WriteLine("CreateProductDecorator:HandleAsync");
+        var result = await inner.HandleAsync(context, cancellationToken);
+        Console.WriteLine("CreateProductDecorator:HandleAsync:Done");
+        return result;
+    }
+}

samples/MediatorSample/Program.cs

@@ -13,16 +13,16 @@
     .AddMediator()
     .Decorate<IMediator, LoggingMediator>();
 
-services.AddMediatorHandler<ProductCreated, ProductCreatedHandler>()
-        .Decorate<ProductCreatedDecorator>();
+services.AddMediatorHandler<CreateProduct, CreateProductHandler>()
+        .Decorate<CreateProductDecorator>();
 
 services.AddMediatorHandler<ProductCreatedQuery, string, ProductCreatedQueryHandler>();
 services.DecorateMediatorHandler<ProductCreatedQuery, string, ProductCreatedQueryHandlerDecorator>();
 
 var serviceProvider = services.BuildServiceProvider();
 var mediator = serviceProvider.GetRequiredService<IMediator>();
 
-await mediator.SendAsync(new ProductCreated(1, "Product 1"));
+await mediator.SendAsync(new CreateProduct(1, "Product 1"));
 var result = await mediator.SendAsync<ProductCreatedQuery, string>(new ProductCreatedQuery());
 
 Console.WriteLine("Done");

samples/MessagingSample/MessagingSample.csproj

@@ -4,6 +4,7 @@
     <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
+    <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>