Please make it to able to add icons in corners

It would be more user-intuitive if there are icons at the corners instead of just rectangle corner.

Here is the example icon:

No source files, tests, or entry points are named. Start by locating the Android cropper UI code that draws the rectangle corners, then review how corner controls are represented and rendered. Done means the cropper displays the requested icons at its corners instead of only the current rectangular corner markers, with the example image used as the visual reference.

Written by the indexing model from the issue text.