Peter White Television EditorA3 Artists Agency is moving aggressively into the podcast space with the launch of its own podcast production company, Big Spark Studios.The talent agency will kick off the new venture with its first project, an unscripted series hosted by Million Dollar Listing Los Angeles star James Harris, followed by shows featuring Real Housewives of Beverly Hills star Denise Richards and Vanderpump Rules’ Ariana Madix.It comes three months after the company, which was rebranded