For Babe Ruth’s Descendant, a Surprise By TERESA WINCHESTER Visits to Cooperstown have always been part of Amanda Stevens’ life. For the annual Baseball Hall of Fame Induction, her family would rent a house here and stay for several days. (Her father and brother still make the yearly pilgrimage.) And she often had a chance to meet Major League ballplayers. (Cal Ripken Jr. is her favorite.) For Stevens, now living in Cambridge, Mass., is Babe Ruth’s great-granddaughter. “There are many…