The former “Harry Potter” star is all about work that is “eccentric and unusual,” and he tells IndieWire why a BDSM relationship comedy with Alexander Skarsgård promised all that, and more. At just 36, British actor Harry Melling has already displayed an extraordinary range. He defines a character actor; not a bad place to be. After clocking five “Harry Potter” titles as the titular hero’s bullying cousin Dudley Dursley — and getting so much taller and leaner during drama school LAMDA that he