It’s probably impossible to make the definitive documentary about a figure like David Bowie, who was so much larger and grander than life. The beauty of Brett Morgen’s velvet-and-facepaint collage Moonage Daydream is that it doesn’t try to be definitive. Instead, it’s a glide through Bowie’s career, hardly complete yet somehow capturing both the spirit and the genius of this most enigmatic and alluring artist. Morgen—whose films include the Kurt Co…