Feature request: Auto add height/width attributes

So right now, I see we have the option to add the height/width attributes ourselves. I would _love_ it if the component determined the height/width of the source image automatically and used that for those attributes (could still be an optional flag to include them).

The exact situation I'd love to use this is on a marketing page where product images change fairly frequently, as do the actual dimensions. Having height/width auto generated would be amazing as I could just update the image and enhance-image would do everything else for me.