It’s a fore-tunate time for youth golf on Long Island. Coaches say the sport has grown exponentially at the high school level locally, thanks greatly to the worldwide spectacle of the Ryder Cup at Bethpage Black last month, which inspired a new generation to hit the links. “We’re a school that graduates about 120, and we had 42 kids try out this year,” Cold Spring Harbor varsity coach Jamie Lawlor told The Post during a Tuesday practice at Huntington Country Club. “The last time we really saw