Oscar-winning sound designer/supervising sound editor Richard King (“Dunkirk,” “Inception,” “The Dark Knight,” “Master and Commander: The Far Side of the World”) has two frontrunners this year with Christopher Nolan’s explosive “Oppenheimer” and Bradley Cooper’s musical “Maestro.” While each offers very different soundscapes, they capture the essence of these two 20th-century giants of quantum physics and music. For the sound design of the biopi…