Add factory method to PagedListResponse

This update introduces a static factory method `From` in the `PagedListResponse` class. It allows for the creation of `PagedListResponse` instances directly from `Page` objects, streamlining object instantiation.

src/common/Elsa.Api.Common/Models/PagedListResponse.cs

@@ -16,4 +16,6 @@ public PagedListResponse(Page<T> page)
 
     public ICollection<T> Items { get; set; } = default!;
     public long TotalCount { get; set; }
+
+    public static PagedListResponse<T> From(Page<T> page) => new(page);
 }