Add support for time, date, duration, and decimal dtypes
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['Is there a dataset which uses these four datatypes for tests purposes?\r\n'
 "@severo Not yet. I'll let you know if that changes."]
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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. 
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