Feature request: Closing folding range UI/UX

[vasiltabakov]

It would be great for the folding ranges to be indicated with a 'closing' interactable icon apart from 'starting' icon. This would allow to fold a long range from where it ends:

Here's an example:

There would be an icon at the if closing bracket line.
I imagine to implement this would also require changing the start/end icon of the range.

To the very least it would be great to have an indication of where the range ends (as in VS).

[aeschli]

Dup of #60670