Before the popularity of true crime exploded, the 2004 French docuseries “The Staircase” was one of the genre’s crown jewels. Jean-Xavier de Lastrade’s non-fiction chronicle of the mystery surrounding the 2001 death of Kathleen Peterson won a Peabody Award in 2005, anticipating the success of podcasts like “Serial” and docuseries like “The Jinx.” Now, the infamous story is coming to HBO Max in a new scripted adaptation from writer/director Antonio Campos (“The Devil All the Time”).