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.Domain/Entities/ProductImages.cs

@@ -5,6 +5,6 @@ public class ProductImages : BaseAuditableEntity
     public string Title { get; set; }
     public string ImagePath { get; set; }
     public string ImageThumbnailPath { get; set; }
-    //ProductGallerys Collection Navigation Reference
-    public virtual ICollection<ProductGallerys> ProductGalleryss { get; set; }
+    //ProductGalleries Collection Navigation Reference
+    public virtual ICollection<ProductGalleries> ProductGalleries { get; set; }
 }