No one else makes sci-fi like writer/director Alex Garland. After writing movies like “28 Days Later,” “Sunshine” and “Never Let Me Go,” he turned also to directing, churning out in succession the feature films “Ex Machina” (2014) and “Annihilation (2018).” His latest as a writer/director, the FX/Hulu series “Devs,” maintains many of the traits that...