It’s quite a Sharks tale. Two college-basketball nuts have reeled in huge team spirit for the March Madness-bound Sharks of Long Island University with a hot new signature wave — despite neither having even attended the school. “I would say one of the things about our friendship … is an obsession with college basketball ,” Cameron Koffman told The Post of the unwavering commitment he and longtime pal David Pochapin have for LIU. “And a love for a really, really drawn-out passion side project,”