“I’m a difficult person. Everyone’s a difficult person.” Abrupt, unwashed, and honest to a fault, the character of Adam Sackler in Lena Dunham’s Girls (2012–17) was a knot of contradictions, one made plausible and (yes!) desirable by a breakout actor with the same first name. At 28, Adam Driver had an oil-and-water intrigue all of his own. He was a veteran...