Added dumpers row

Added dumpers row

Speed up repeated dumps on the same query (e.g. in executemany, in copy,
for composite types).

Things are a bit iffy around empty list dumping. As a tradeoff, prefer
that empty list don't behave too differently from non-empty list, but
accept that text and binary work differently (because it doesn't seem
possible to pass an array as unknown in binary, whereas in text '{}'
works ok).