After a banner 2021 for high-end genre films, industry vets are hopeful that the fantastic can resurrect the corpse of pre-COVID theatrical distribution. As bolts of lightning reanimated the body of Frankenstein’s monster, Julia Ducournau’s “Titane,” which turned heads when it took the Palme d’Or at Cannes, and Sundance Grand Jury prize-winner “Nanny,” a supernatural