Todd Spangler NY Digital EditorSpotify is unleashing three original comedy podcasts, including a high-concept scripted show from “Saturday Night Live” alum Fred Armisen.In “The Sketch Factor,” Armisen (“Portlandia,” “Documentary Now!”) plays Xandor Szavost, an inventor, philanthropist and billionaire who’s using his fortune to finance an audio sketch-comedy competition for his own amusement. Each three-to-five minute episode features a sketch to be judged by Xandor.