Once written off as an extreme long shot in the long-running Johan Santana drama, the Mets may actually be the favorite now. At the very least, there are indications now that they are engaging in more regular dialogue with the Twins in recent days than either the Red Sox or Yankees. And Mets general manager Omar Minaya, who loves a big deal but hasn’t made one since the winter before last, has told some people in the business, “We have a shot.’‘