Introduce new default groupby options: (i) time: to group data by
hourly; (ii) time-d: to group data by day of the year; (iii) time-w:
to group data by week of the year; (iv) time-m: to group data by month;
and, (v) time-y: to group data by year. If you have old data in
CloudKitty and you wish to use these group by methods, you will need
to reprocess the desired timeframe.
Story: #2009839
Task: #44438
Depends-On: https://review.opendev.org/c/x/wsme/+/893677
Change-Id: Iad296f54f6701af84e168796aec9b1033a2a8a2d
45f5e72472