fix: boxed_zoom_rect not in foreground

[IVAN-MK7]

This PR reverts the regression introduced in the 0.35.0 release, where the boxed_zoom_rect gets painted behind the plot's content (shapes, images, grid, etc...), effectively restoring the behaviour present up to the 0.34.0 release, bringing back the drawn rectangle to the foreground.

The issue and the resulting appearence are thoroughly documented in the issue this PR addresses:

• Closes boxed_zoom_rect gets painted behind the plot's items (shapes, images, etc...) #240
• I have followed the instructions in the PR template

[github-actions]

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[stephenberry]

Can we get this merged? I ran into the same issue and it's really bad for PlotImage because the selection box can't be seen at all.

[lucasmerlin]

I think moving this down would introduce a frame delay when moving the camera.
Maybe instead we can return a Vec from handle_interaction that we can later add to the painter to solve the ordering issue?

[IVAN-MK7]

This PR fixes the mentioned bug, I've been using it for the last few months and didn't notice any issue that could have been caused by it.
A frame delay side effect seems plausible, but it's less of an issue that the bug it solves, so I think it can be addressed after the merge, or by including now in the discussion those who worked on that method, because I'm not diving into it when they definitely understand it more, regarding this and other eventual side effects that I might miss, and can act quicker.
Seeing the commits that caused the bug, I'm tagging @michalsustr, hopefully he knows the behind the scenes of it, and did not just do a refactor.

Also, the visual testing of the app resulting from this library should be improved, have it been done better this issue would't have come up.