Add PagedViewModel (#12955)

Co-authored-by: Zeegaan <nge@umbraco.dk>
(cherry picked from commit 9a2ead4381)

src/Umbraco.Cms.ManagementApi/ViewModels/Pagination/PagedViewModel.cs

@@ -0,0 +1,8 @@
+namespace Umbraco.Cms.ManagementApi.ViewModels.Pagination;
+
+public class PagedViewModel<T>
+{
+    public long Total { get; set; }
+
+    public IEnumerable<T> Items { get; set; } = Enumerable.Empty<T>();
+}