Use PREPARE/EXECUTE statements for applying DML in follow mode. #420
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When replaying INSERT/UPDATE/DELETE statements, switch to using PREPARE and
EXECUTE at the protocol level (using the libpq functions PQprepare and
PQexecPrepared). When a statement has already been prepared previously in
our session, we then only send the EXECUTE statement.
This should provide nice performance improvements.
See #414.