Credit: Brad Penner-Imagn ImagesNew York Mets broadcasting legend Howie Rose is set to hang it up next month when the team plays their final home game of the season against the Philadelphia Phillies on Sept. 20. It’ll be the end of an era for several generations of Mets fans. Rose, 72, began as a broadcaster for the team in 1987 and has remained part of the fabric of Mets baseball ever since. This season, Rose scaled back his play-by-play duties…