Brian Steinberg Senior TV EditorThe NFL for decades has relied on intermediaries like CBS, ESPN or Fox to deliver its best-known product — football games — to the masses. Now the league is getting ready to try a new play.The NFL is launching NFL+, a stand-alone subscription-based streaming outlet that offers as much professional football as possible without tripping over the boundaries already established by the league’s big-ticket contracts with Disney, Fox, Paramount Global, NBCUniversal and Amazon.