add: remove overlay #5
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This PR exposes the removeOverlay function in aladin-lite, allowing users to programmatically remove overlays from their viewer. This PR also includes an initial approach for users to programmatically retrieve a list of the current overlays on the widget using the traitlet overlays, which is updated upon calling remove_overlay() and get_overlay.
I have written some basic, initial tests that confirm messages are being passed to the javascript side of things.
A short demo of adding some overlays and subsequently removing them, while checking the overlays traitlet throughout for sanity is shown below:
demo.mov