Add new InList and InArray extension methods

Author: mythz

src/ServiceStack.Text/ListExtensions.cs

@@ -62,5 +62,15 @@ public static T[] NewArray<T>(this T[] array, T with = null, T without = null) w
 
             return to.ToArray();
         }
+
+        public static List<T> InList<T>(this T value)
+        {
+            return new List<T> { value };
+        }
+
+        public static T[] InArray<T>(this T value)
+        {
+            return new[] { value };
+        }
     }
 }