To most, pingpong is just a game to play in a friend’s garage or backyard on a warm summer day. To Marty Mauser (Timothée Chalamet), the fast-talking hustler at the center of Josh Safdie’s “Marty Supreme,” it’s a chance to prove he is great at something and can be better than anyone else he’s matched up against.As the movie opens, Marty is working as a shoe salesman in a store owned by his uncle. He’s twitchy and charismatic, quickly proven