Add support for time, date, duration, and decimal dtypes
Is there a dataset which uses these four datatypes for tests purposes?
 @severo Not yet. I'll let you know if that changes.
Add support for the pyarrow time (maps to `datetime.time` in python), date (maps to `datetime.time` in python), duration (maps to `datetime.timedelta` in python), and decimal (maps to `decimal.decimal` in python) dtypes. This should be helpful when writing scripts for time-series datasets. 