Add image to GoogleLingSitemapUrl

[Klapsa2503]

Currently we can add alternatees by using GoogleLinkSitemapUrl and images by using GoogleImageSitemapUrl. In my case I want to have both at the same time to achieve following output:

<url>
  <loc>http://www.example.com/en/product-1</loc>
  <xhtml:link rel="alternate" hreflang="de" href="http://www.example.com/de/product-1" />
  <xhtml:link rel="alternate" hreflang="en" href="http://www.example.com/en/product-1" />
  <image:image>
   <image:loc>http://www.example.com/image1.jpg</image:loc>
  </image:image>
  <image:image>
   <image:loc>http://www.example.com/image2.jpg</image:loc>
  </image:image>
</url>

What do you think? My idea is to add images to GoogleLinkSitemapUrl and maybe deprecate GoogleImageSitemapUrl. I will implement it myself but want to confirm solution with the community first