The Padres moved to address the hole in the back end of their bullpen Monday by trading for the best closer in the major leagues. And what they sent to Milwaukee for Josh Hader does not preclude them from continuing to engage in talks with the Nationals about acquiring Juan Soto, the main prize they seek to upgrade their offense. The Padres sent the Brewers relievers Taylor Rogers and Dinelson Lamet and outfielder Esteury Ruiz, as well as minor leaguer Robert Gasser, their No. 7 prospect who has been pitching at Single-A Fort Wayne. Hader, a left-hander, has saved a major league-leading 29 gam…