Refactor Date/Time next_occurring and prev_occurring
These methods were originally added in https://github.com/rails/rails/pull/26600 This includes a couple of refactors to make these methods behave more similarly to other Date/Time extensions added by Active Support: 1. Use `advance` instead of `since` and `ago` to time-travel — this is particularly important to keep the returned instance’s class matching `self`. Before this change: today = Date.today # => Tue, 28 Nov 2017 today.class # => Date today.next_occurring(:wednesday) # => Wed, 29 Nov 2017 00:00:00 UTC +00:00 today.next_occurring(:wednesday).class # => ActiveSupport::TimeWithZone After this change, a Date (or Time, or DateTime) instance is properly returned (just like is shown in the new docs). This is generally how everything else in DateAndTime::Calculations works. 2. Move the tests from the DateTime tests to the DateAndTimeBehavior tests. The latter location is mixed in to the core_ext tests for _all_ of Date, Time, and DateTime to test the behavior across all of the classes. The previous location is for testing core_ext functionality added specifically just to DateTime. 3. Better docs!
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