ENH: Add days_in_month property to Timestamp/DatetimeIndex/... (GH9572) #9605
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closes #9572
Added days_in_month property (compatibility alias daysinmonth) to Timestamp, DatetimeIndex, Period, PeriodIndex,
Series.dt.
Although not mentioned in the GH issue, I added the property to Period and PeriodIndex to be consistent with the others: dayofweek, dayofyear, etc.