QOCI driver does not handle timezone information

Similarly to QTBUG-36211, the QOCI driver for QSQL does not parse timezone info into QDateTimes when using toDateTime() or bindValue(). Apparently it always inserts with local timezone, and always retrieve data as if it was stored with local timezone.

Following is a list of Oracle data type I tested with, and what I propose is the correct behavior. This is however ignoring the fact that the behavior should be dictated by what is done for any overlapping datatype in other drivers. Obviously for any datatype common between the drivers, the same should be done in all drivers.