Options for guiding image region selection

Either per image on the post, or as a general plugin option, it would be nice, as a user, to be able to help and restrict which image regions will be selected.

The plugin would make use of https://github.com/Frameright/image-display-control-web-component/issues/2 to implement this feature.

Start by reviewing the requested per-image and general plugin options in the issue, then read the linked Frameright/image-display-control-web-component issue #2. Done means users can restrict the image regions selected through one or both proposed configuration paths, with the integration behavior agreed and verified.

Written by the indexing model from the issue text.