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 and self-discovery in 1911 Pittsburgh — Bertha owns a boardinghouse with her pragmatic, if sometimes prickly, husband, Seth, played by Cedric the Entertainer. Debbie Allen directs the revival.  Henson, 55, says she stands a tad straighter thanks to this cherished career first, and it’s not just because Bertha is the upright center of the play. Henson credits a key foundational element beneath Bertha’s homey dresses and aprons. “I have terrible posture,” she confesses.…