Group interdependent checkboxes visually

Description of the need

Since https://github.com/backdrop/backdrop-issues/issues/5567 the Search checkbox of the Administration bar settings is only showed if the Management menu checkbox is checked. We agreed that a visual grouping of those interdependent checkboxes could be useful, but weren't sure if there's already an visual pattern for such a case in Backdrop core, so we decided to make a follow-up issue issue to handle the grouping.

Proposed solution

Look if there is a suitable pattern for interdependent checkboxes, or find a new one, and add it to the Admin bar settings.

Alternatives that have been considered

–

Draft of feature description for Press Release (1 paragraph at most)

Backdrop now has the ability to group interdependent checkboxes visually.