Taraji P. Henson’s closet is as boldly eclectic as her career. “I’m a mood dresser,” she tells Alexa over Zoom. “One day I may have on a baseball cap and some sweats, and the next day I may have on a full Schiaparelli look. Dressing up for me is like putting on a character.”  Henson’s latest alter ego is the benevolent and caring Bertha Holly in August Wilson’s “Joe Turner’s Come and Gone,” and it marks her long-awaited Broadway acting debut. In the play — which explores themes of displacement