LAS VEGAS — The national championship game between Dawn Staley-coached South Carolina and Caitlin Clark-led Iowa is expected to break sports betting records. Undefeated South Carolina is a 6 1/2-point favorite at FanDuel Sportsbook to beat the Hawkeyes on Sunday and avenge last year’s 77-73 semifinal loss to Iowa. “Early action is on Caitlin Clark and Iowa to upset South …