RLS: 0.24.0
Tracking issue

[Open PRs](https://github.com/pandas-dev/pandas/pulls?q=is%3Aopen+is%3Apr+milestone%3A0.24.0)
[Open Issues](https://github.com/pandas-dev/pandas/issues?q=is%3Aopen+is%3Aissue+milestone%3A0.24.0)

Let's whittle down. I just looked the lastest whatsnew and its huge. Let's get this out sooner rather than later. I know there are some blocking issues: DatetimeArray & What do do with CalendarDay.