Caroline Framke Chief TV CriticSPOILER ALERT: Do not read if you have not watched the third and final season of “Shrill,” now streaming on Hulu.Halfway through its second season, “Shrill” beat its wayward characters to the punch by figuring itself out completely.Based on Lindy West’s memoir of the same name, the Hulu comedy spent much of tis first season fixated on a single cataclysmic event.