NEW YORK – For an agonizing matter of seconds that felt like minutes, the entire focus of CitiField turned to first base umpire Chad Whitson and his decision. For the Mets, it would be an improbable victory in front of packed crowd and another series win in an already successful season where they had yet to lose one. For the Mariners, they were on the precipice of taking what might be one of their best wins of an up-and-down season and turning it into a catastrophic defeat that would likely linger for weeks. A walk ties the game. A hit probably ends it. And any sort of an out meant celebration…