Select every shape (footprint, source, MOC tile) within a polygon

[imbasimba]

Instead of having to select every source or footprint of interest individually, it would be great to allow users to draw polygons, circles, and rectangles to select all shapes within the drawn region.

Deselection should also be possible by drawing a shape, but I'm not sure what the best solution is for that. In ESASky, we make deselections by drawing from right to left, but there may be better ways of doing that. Potentially holding the alt key while drawing the shape or something along those lines.

Examples of how it was patched into Aladin Lite 2:
https://www.youtube.com/watch?v=wGKX6L1sMw4&t=8s

[bmatthieu3]

This is a good thing to have in the aladin lite core. This is somewhat linked to #81

[bmatthieu3]

there is a new select method with different modes. Documentation is here: https://cds-astro.github.io/aladin-lite/Aladin.html#select

[ManonMarchand]

Related to cds-astro/ipyaladin#8