Add validators and services for Product Galleries and Product Tags

- Implemented Create, Delete, Get, and Update validators for Product Galleries.
- Added Create, Delete, Get, and Update validators for Product Tags.
- Created service classes for handling Discount Categories, Discount Orders, Discount Products, Discount Shopping Cart, Product Categories, Product Galleries, and Product Tags.
- Each service class integrates with CQRS for command and query handling.
- Established mapping profiles for Product Galleries.

src/CMSMicroservice.Application/ProductGalleriesCQ/EventHandlers/CreateNewProductGalleriesEventHandlers/CreateNewProductGalleriesEventHandler.cs

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+using CMSMicroservice.Domain.Events;
+using Microsoft.Extensions.Logging;
+
+namespace CMSMicroservice.Application.ProductGalleriesCQ.EventHandlers;
+
+public class CreateNewProductGallerysEventHandler : INotificationHandler<CreateNewProductGallerysEvent>
+{
+    private readonly ILogger<
+        CreateNewProductGallerysEventHandler> _logger;
+
+    public CreateNewProductGallerysEventHandler(ILogger<CreateNewProductGallerysEventHandler> logger)
+    {
+        _logger = logger;
+    }
+
+    public Task Handle(CreateNewProductGallerysEvent notification, CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("Domain Event: {DomainEvent}", notification.GetType().Name);
+
+        return Task.CompletedTask;
+    }
+}

src/CMSMicroservice.Application/ProductGalleriesCQ/EventHandlers/DeleteProductGalleriesEventHandlers/DeleteProductGalleriesEventHandler.cs

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+using CMSMicroservice.Domain.Events;
+using Microsoft.Extensions.Logging;
+
+namespace CMSMicroservice.Application.ProductGalleriesCQ.EventHandlers;
+
+public class DeleteProductGallerysEventHandler : INotificationHandler<DeleteProductGallerysEvent>
+{
+    private readonly ILogger<
+        DeleteProductGallerysEventHandler> _logger;
+
+    public DeleteProductGallerysEventHandler(ILogger<DeleteProductGallerysEventHandler> logger)
+    {
+        _logger = logger;
+    }
+
+    public Task Handle(DeleteProductGallerysEvent notification, CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("Domain Event: {DomainEvent}", notification.GetType().Name);
+
+        return Task.CompletedTask;
+    }
+}

src/CMSMicroservice.Application/ProductGalleriesCQ/EventHandlers/UpdateProductGalleriesEventHandlers/UpdateProductGalleriesEventHandler.cs

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+using CMSMicroservice.Domain.Events;
+using Microsoft.Extensions.Logging;
+
+namespace CMSMicroservice.Application.ProductGalleriesCQ.EventHandlers;
+
+public class UpdateProductGallerysEventHandler : INotificationHandler<UpdateProductGallerysEvent>
+{
+    private readonly ILogger<
+        UpdateProductGallerysEventHandler> _logger;
+
+    public UpdateProductGallerysEventHandler(ILogger<UpdateProductGallerysEventHandler> logger)
+    {
+        _logger = logger;
+    }
+
+    public Task Handle(UpdateProductGallerysEvent notification, CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("Domain Event: {DomainEvent}", notification.GetType().Name);
+
+        return Task.CompletedTask;
+    }
+}