efl_ui_image: implement missing API

efl_ui_image: implement missing API

the API calls have not been implemented, this revision implements these
APIs as redirects to the image if those are a edje object.

Normally this should be a calling the legacy edje API. However, this is
here really hard as imitating the correct callback behaviour is hard.
And the correct behaviour with the eina value type is also just leading
to copying the implementation from edje. So in order to keep the amount
of code low here, this just uses the efl-api to redirect the requests.

Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Differential Revision: https://phab.enlightenment.org/D9989