NEW YORK — One swing of Pete Alonso’s super-charged bat on Sunday night may end up as a turning point of the Mets’ season. The Mets’ 8-5 win over the San Diego Padres — who had beaten the Mets four out of five times entering the game — was accelerated by Alonso in the bottom of the sixth inning. One swing, 425 feet, three runs and a lead for the Mets that they so viciously needed. Alonso recreated the elation that everyone in attendance knew these Mets could provide, but up until his ball actually nestled into the stands, nobody knew for sure when they’d feel it next. Teams are going to have a…