EXCLUSIVE: David Heyman and StudioCanal are reteaming for a feature film adaptation of the classic family book The Secret Garden. Heyman will produce with Rosie Alison through his Heyday Films banner. They have tapped Jack Thorne, arguably the UK’s most in-demand writer, to adapt Frances Hodgson Burnett’s beloved story about Mary Lennox, a troubled, sickly, orphaned 10-year-old girl sent to live with an uncle after her parents have died in a cholera outbreak in India…