Support a wider range of PostgreSQL temporal field types

[JBurkinshaw]

During data interrogation, temporal fields are identified and used to derive metadata to support temporal filtering in dat requests. TIMESTAMP WITH TIME ZONE, TIMESTAMP WITHOUT TIME ZONE, and DATE PostgreSQL types are currently supported.

PostgreSQL also supports a number of range-like temporal data types which are not currently supported (source):

• tsrange — Range of timestamp without time zone
• tstzrange — Range of timestamp with time zone
• daterange — Range of date

Add support for each of these temporal range types.

More information on temporal fields is included in the readme.