Adam Wainwright has now truly done it all in a Cardinals uniform. The pitcher’s 19th and final season in St. Louis started off with … fireworks … when he stepped out of the player line to sing the national anthem ahead of a matchup with the Blue Jays on Opening Day. Here’s what you need to know: Wainright, a three-time All-Star, two-time Gold Glove winner and 2006 World Series champion, announced in October he would return for one last season to close out his illustrious career. He is starting the season on the injured list after suffering a groin strain…