One week, “Quantum Leap” star Raymond Lee was wearing a 50-pound space suit for 12 hours a day. The next, he was in a boxing ring. The next, he’d be focused more on the emotional strain. “It’s a dream job. I don’t have ADD but I like new things. I like being constantly stimulating. I like learning new things,” the 35-year-old actor told the Daily News. “For somebody who considers himself a jack-of-all-trades but a master of none, I think this is a pretty perfect job.” Lee stars in the new version of “Quantum Leap,” which premiered Monday and set 30 years after the original. But he’s not steppi…