Business Hours Block: add "bulk" option where days with similar hours are grouped

> Wondering if we might have a quick way to set M-F hours instead of updating each day individually, since that would probably be the most common use case. Or maybe by default we could show a M-F entry and a Sat/Sun entry and apply those settings to the range?
>
> For businesses that run non-standard hours, they could expand the full list and make those edits.


Start by locating the Business Hours Block implementation and its current per-day hours controls. Review the linked screenshot and determine how grouped weekday ranges should be represented and edited. Done means users can set shared hours for ranges such as Monday-Friday while retaining a way to edit non-standard days individually.

Written by the indexing model from the issue text.