The Rangers’ fourth line has taken a big hit — both in physical size and in impact.Adam Edstrom is out for two-and-a-half to three-and-a-half months with a lower-body injury.He exited the Rangers’ loss to the Bruins on Saturday with the injury and subsequently missed the team’s win over the Golden Knights on Sunday.Edstrom who stands at a towering 6-foot-7 and 234 pounds, has five goals and four assists this year, his second in the NHL after the Rangers drafted him in the sixth round in 2019....