Marilyn Stasio Theater CriticIn Antoinette Chinonye Nwandu’s surreal and morbidly funny existential drama “Pass Over,” two characters who might be fugitives from a Samuel Beckett play find themselves in a world where being Black means being trapped forever on a blasted heath on the wrong side of the Promised Land.There are Biblical and literary references galore in the playwright’s seriously brainy meditation on the Black experience, the first full play to open on Broadway since the lockdown