This allows to fetch merged opening hours instead of actually edited
opening hours.
They will be merged per valid time span.
The data structure is a bit different as each time span has a list of
week days, each with its own open and end.
Relates: #10246
Opening hours are filtered. Opening hours from the past are no longer
available.
Opening hours are sorted. Newer opening hours are shown last.
Relates: #10185
