The NBA Dunk Contest is on relevancy life support ... but Julius Erving , the first-ever winner in the event, has a way to save it -- telling TMZ Sports it's time for the league's biggest stars to brush up on their history. We caught up with the Hall of Famer in NYC this week ... and considering he has countless iconic slams to his name, we had to ask about the state of the All-Star Weekend staple. It's no secret fans are starting to roll their eyes at it ... with randos competing against each