[DSC] Add support for ImageresizerSizes property (#32657)

Add support for ImageresizerSizes property

- do not use ints for enums in ImageSize struct
- add required converters
- extend setAdditional functionality
- add samples

Co-authored-by: Andrey Nekrasov <1828123+yuyoyuppe@users.noreply.github.com>

src/settings-ui/Settings.UI/Converters/ImageResizerUnitToIntConverter.cs

@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using Microsoft.PowerToys.Settings.UI.Library;
+using Microsoft.UI.Xaml.Data;
+
+namespace Microsoft.PowerToys.Settings.UI.Converters;
+
+public sealed class ImageResizerUnitToIntConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is ResizeUnit)
+        {
+            return (int)value;
+        }
+
+        return 0;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        if (value is int intValue)
+        {
+            return (ResizeUnit)intValue;
+        }
+
+        return ResizeUnit.Centimeter;
+    }
+}