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.WebApi/Common/Mappings/ProductGalleriesProfile.cs

@@ -0,0 +1,10 @@
+namespace CMSMicroservice.WebApi.Common.Mappings;
+
+public class ProductGallerysProfile : IRegister
+{
+    void IRegister.Register(TypeAdapterConfig config)
+    {
+        //config.NewConfig<Source,Destination>()
+        //    .Map(dest => dest.FullName, src => $"{src.Firstname} {src.Lastname}");
+    }
+}