Sally Rooney is a writer people talk about. Since her first novel, “Conversations With Friends,” was published in 2017, Rooney has been hailed as a defining voice of the millennial generation because of her ability to capture the particular angst and confusion of young love, friendship and coming-of-age in our fraught digital era. In this week’s episode, the Book Review’s MJ Franklin discusses “Intermezzo,” her fourth and latest novel, with his fellow editors Joumana Khatib, Sadie Stein and Dave Kim.