Log DTO items even if validation fails

Source/AudibleUtilities/ImportValidationException.cs

@@ -0,0 +1,15 @@
+using AudibleApi.Common;
+using System;
+using System.Collections.Generic;
+
+namespace AudibleUtilities
+{
+	public class ImportValidationException : AggregateException
+	{
+		public List<Item> Items { get; }
+		public ImportValidationException(List<Item> items, IEnumerable<Exception> exceptions) : base(exceptions)
+		{
+			Items = items;
+		}
+	}
+}