This World Cup, the major players aren’t just on the pitch. The wives and girlfriends (WAGs) of soccer stars are increasingly stars in their own right, making millions with brand deals, sponsorships, and product launches.  “Social media has opened up the possibilities tenfold for this generation of WAGs,” Lindsey Cook, Co-CEO of The Digital Dept, an influencer marketing agency in Los Angeles told The Post. “It used to be that unless you were Victoria Beckham and already famous in your own right,