Represents a collection of FeedItem schedules specifying all time intervals for which
the feed item may serve. Any time range not covered by the specified FeedItemSchedules will
prevent the feed item from serving during those times.
List of non-overlapping feed item schedules indicating when the feed item may serve.
There can be a maximum of 6 FeedItemSchedules per day.
If empty, the scheduling will be cleared of all FeedItemSchedules indicating the feed item
has no scheduling restrictions.