BOSTON — It has been a busy few months for Ranger Suarez, who left the only professional home he has ever known in Philadelphia to join the Red Sox on a $130 million contract in January, won the World Baseball Classic with Venezuela a few weeks later and has overcome a tough start to the season to be a rotation stalwart for the Red Sox in the first year of his five-year deal. Entering Friday night’s start in Seattle, Suarez owns a 3.21 ERA (and …