Avoid resend METADATA information in binary protocol if not changed

Resultset always contains metadata information.
Using binary protocol, the goal is that that information is skipped if metadata has not changed since last send and driver support metadata skipping.

In resultset, first packet is column_count_packet. Current format is :
int<lenenc> column count
Solution could be sending some very big value, like 0xffffff length encoded, so 0xfdffffff in column count