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/Commands/DeleteProductGalleries/DeleteProductGalleriesCommand.cs

@@ -0,0 +1,7 @@
+namespace CMSMicroservice.Application.ProductGalleriesCQ.Commands.DeleteProductGalleries;
+public record DeleteProductGalleriesCommand : IRequest<Unit>
+{
+    // 
+    public long Id { get; init; }
+
+}

src/CMSMicroservice.Application/ProductGalleriesCQ/Commands/DeleteProductGalleries/DeleteProductGalleriesCommandHandler.cs

@@ -0,0 +1,22 @@
+using CMSMicroservice.Domain.Events;
+namespace CMSMicroservice.Application.ProductGalleriesCQ.Commands.DeleteProductGalleries;
+public class DeleteProductGallerysCommandHandler : IRequestHandler<DeleteProductGalleriesCommand, Unit>
+{
+    private readonly IApplicationDbContext _context;
+
+    public DeleteProductGallerysCommandHandler(IApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<Unit> Handle(DeleteProductGalleriesCommand request, CancellationToken cancellationToken)
+    {
+        var entity = await _context.ProductGalleries
+            .FirstOrDefaultAsync(x => x.Id == request.Id, cancellationToken) ?? throw new NotFoundException(nameof(ProductGallery), request.Id);
+        entity.IsDeleted = true;
+        _context.ProductGalleries.Update(entity);
+        entity.AddDomainEvent(new DeleteProductGallerysEvent(entity));
+        await _context.SaveChangesAsync(cancellationToken);
+        return Unit.Value;
+    }
+}

src/CMSMicroservice.Application/ProductGalleriesCQ/Commands/DeleteProductGalleries/DeleteProductGalleriesCommandValidator.cs

@@ -0,0 +1,16 @@
+namespace CMSMicroservice.Application.ProductGalleriesCQ.Commands.DeleteProductGalleries;
+public class DeleteProductGallerysCommandValidator : AbstractValidator<DeleteProductGalleriesCommand>
+{
+    public DeleteProductGallerysCommandValidator()
+    {
+        RuleFor(model => model.Id)
+            .NotNull();
+    }
+    public Func<object, string, Task<IEnumerable<string>>> ValidateValue => async (model, propertyName) =>
+    {
+        var result = await ValidateAsync(ValidationContext<DeleteProductGalleriesCommand>.CreateWithOptions((DeleteProductGalleriesCommand)model, x => x.IncludeProperties(propertyName)));
+        if (result.IsValid)
+            return Array.Empty<string>();
+        return result.Errors.Select(e => e.ErrorMessage);
+    };
+}