Off the back of a string of award-nominated films about romance and angst in the Italian countryside (with the notable exception of “Suspiria”), Luca Guadagnino is bringing his sunny, sentimental cinematic style to television for the first time, with the eight-episode series “We Are Who We Are.” A story about two American kids who live on a U.S. military base in Italy, the series explores friendship, first love, identity, and all the messy exhilaration and anguish of being a teenager.