Support setting object-fit for generated image output

[tuzhichang]

We’re currently using snapdom to capture full pages or specific DOM regions and export them as png / jpg / svg. One feature we found missing (and would be very useful in real-world layouts) is the ability to control the object-fit behavior of the generated image.

Describe the solution you'd like
It would be great if snapdom could support configuring object-fit for the output image, for example by:

Allowing an objectFit option in the API, e.g.:

snapdom.toJpg(element, {
  objectFit: 'cover',
  width: 400,
  height: 300
})

[reyhappen]

snapdom.toJpg returns an HTMLImageElement, just set css for the element. The feature is unnecessary