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/Events/ProductGalleriesEvents/CreateNewProductGallerysEvent.cs

@@ -0,0 +1,8 @@
+namespace CMSMicroservice.Domain.Events;
+public class CreateNewProductGallerysEvent : BaseEvent
+{
+    public CreateNewProductGallerysEvent(ProductGallery item)
+    {
+    }
+    public ProductGallery Item { get;  }
+}

src/CMSMicroservice.Domain/Events/ProductGalleriesEvents/DeleteProductGallerysEvent.cs

@@ -0,0 +1,8 @@
+namespace CMSMicroservice.Domain.Events;
+public class DeleteProductGallerysEvent : BaseEvent
+{
+    public DeleteProductGallerysEvent(ProductGallery item)
+    {
+    }
+    public ProductGallery Item { get;  }
+}

src/CMSMicroservice.Domain/Events/ProductGalleriesEvents/UpdateProductGallerysEvent.cs

@@ -0,0 +1,8 @@
+namespace CMSMicroservice.Domain.Events;
+public class UpdateProductGallerysEvent : BaseEvent
+{
+    public UpdateProductGallerysEvent(ProductGallery item)
+    {
+    }
+    public ProductGallery Item { get;  }
+}