Add a "row processor" API to libpq for better handling of large results.

Traditionally libpq has collected an entire query result before passing
it back to the application.  That provides a simple and transactional API,
but it's pretty inefficient for large result sets.  This patch allows the
application to process each row on-the-fly instead of accumulating the
rows into the PGresult.  Error recovery becomes a bit more complex, but
often that tradeoff is well worth making.

Kyotaro Horiguchi, reviewed by Marko Kreen and Tom Lane

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