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.Protobuf/Validator/ProductGalleries/DeleteProductGalleriesRequestValidator.cs

@@ -0,0 +1,19 @@
+using FluentValidation;
+using CMSMicroservice.Protobuf.Protos.ProductGalleries;
+namespace CMSMicroservice.Protobuf.Validator.ProductGalleries;
+
+public class DeleteProductGalleriesRequestValidator : AbstractValidator<DeleteProductGalleriesRequest>
+{
+    public DeleteProductGalleriesRequestValidator()
+    {
+        RuleFor(model => model.Id)
+            .NotNull();
+    }
+    public Func<object, string, Task<IEnumerable<string>>> ValidateValue => async (model, propertyName) =>
+    {
+        var result = await ValidateAsync(ValidationContext<DeleteProductGalleriesRequest>.CreateWithOptions((DeleteProductGalleriesRequest)model, x => x.IncludeProperties(propertyName)));
+        if (result.IsValid)
+            return Array.Empty<string>();
+        return result.Errors.Select(e => e.ErrorMessage);
+    };
+}