The summer spread laid out across three long banquet-sized tables Wednesday was big enough to be an impressive picnic. But the ingredients were a picnic spread of death and injury. Pistols, rifles, bullets and brass knuckles confiscated from carry-on and checked luggage at Newark Liberty International Airport filled the tables — and more are being found by both Port Authority police and Transportation Security Administration officers. So far, nine guns have been found this year by TSA screeners in carry-on bags, as of June 28, closing in on the total of 12 detected in 2021 at Newark Airport, T…