Support Pandas ExtensionTypes / PyArrow StructTypes
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Description
Hi, would it be possible to support Pandas ExtensionTypes like [IntervalArray](https://github.com/pandas-dev/pandas/blob/526468c8fe6fc5157aaf2fce327c5ab2a3350f49/pandas/core/arrays/interval.py#L190)s?
Right now, it is not possible to read any PyArrow table containing StructTypes using datatable.
Also, I would like to be able implementing my own extension types for advanced features like range joins.
Pandas ExtensionTypes allow implementing all of this for DataFrames.
A similar concept for datatable would ne nice :)
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