Fix sync Postgres deadlocking on empty result set - #3673
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Signed-off-by: itowlson <ivan.towlson@fermyon.com>
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Fixes #3671.
I introduced an error when reworking the synchronous PostgreSQL API on top of the asynchronous one. @shibukawa describes it in detail in the linked issue and there's not much I can add to their explanation! This PR adopts their proposed fix of using a prepared statement to obtain the columns at prepare time instead of trying to infer them as the results come in, which also addresses a long-standing nit around not returning a column list if there were no rows to infer it from.