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/TransactionsEvents/CreateNewTransactionsEvent.cs

@@ -1,8 +1,8 @@
 namespace CMSMicroservice.Domain.Events;
 public class CreateNewTransactionsEvent : BaseEvent
 {
-    public CreateNewTransactionsEvent(Transactions item)
+    public CreateNewTransactionsEvent(Transaction item)
     {
     }
-    public Transactions Item { get;  }
+    public Transaction Item { get;  }
 }

src/CMSMicroservice.Domain/Events/TransactionsEvents/DeleteTransactionsEvent.cs

@@ -1,8 +1,8 @@
 namespace CMSMicroservice.Domain.Events;
 public class DeleteTransactionsEvent : BaseEvent
 {
-    public DeleteTransactionsEvent(Transactions item)
+    public DeleteTransactionsEvent(Transaction item)
     {
     }
-    public Transactions Item { get;  }
+    public Transaction Item { get;  }
 }

src/CMSMicroservice.Domain/Events/TransactionsEvents/UpdateTransactionsEvent.cs

@@ -1,8 +1,8 @@
 namespace CMSMicroservice.Domain.Events;
 public class UpdateTransactionsEvent : BaseEvent
 {
-    public UpdateTransactionsEvent(Transactions item)
+    public UpdateTransactionsEvent(Transaction item)
     {
     }
-    public Transactions Item { get;  }
+    public Transaction Item { get;  }
 }