Brian Steinberg Senior TV Editor Andrew Ross Sorkin is the co-creator of the Showtime series “Billions,” but he isn’t really known for drama in his professional life, just financial reporting. So it came as something of a surprise on Monday, when the CNBC and New York Times journalist got up on stage at New York City’s Radio City Music Hall to tout some of the dramatic fare that NBCUniversal was able to cobble together for the advertisers and media buyers assembled in the audience. It was all part of the industry’s annual “upfront,” when U.S. media companies try to sell the bulk of their advertising inventory before the release of their next cycle of programming.