If the WNBA is going to make the next big step, that stairway to success can be found at Barclays Center. The New York Liberty is one of the original teams in the league and plays in the country’s largest market. It has both a rich past and a superstar-driven present. The national media is noticing. In the past week, the team’s starters have been on the cover of SLAM magazine; its athletic and financial success have been featured in New York Magazine and its emphasis on performance is headlined by The Athletic.