move PeriodIndex comparisons, implement PeriodArray constructor #21798
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PeriodIndex comparisons turn out to be easier to move than the others (though partly because ATM they are broken: #21793), so this moves them over first.
Following that, most of the remaining PeriodArray arithmetic methods require
shift
, which in turns requires the constructors, so I went ahead and implemented those in PeriodArrayMixin. Still holding off on TimedeltaArray and DatetimeArray constructors.Found a few more things that could be harmlessly moved and some docstring fixups.
CC: @jorisvandenbossche @TomAugspurger @jreback