Add tests for PostgreSQL time/timestamp with/without time zone.
Add tests for PostgreSQL time/timestamp with/without time zone.

There are some type binding quirks in PostgreSQL ODBC driver:
* 'time|timestamp without time zone' are reported as SQL_TIME|TIMESTAMP, as expected.
* 'timezone with time zone' is reported as SQL_TIMESTAMP.
* 'time with time zone' is reported as SQL_[W]VARCHAR, not as SQL_TIME.

The last quirk makes it difficult to handle 'time with time zone'
using nanodbc::time.

This change is related to discussion in #224 issue.

ChrisBFX/nanodbc,nanodbc/nanodbc,ChrisBFX/nanodbc,nanodbc/nanodbc