There might not be a more unstoppable quarterback-receiver duo in the NFL than Buffalo Bills superstars Josh Allen and Stefon Diggs. The duo displays a natural chemistry, one that has been on full-throttle through the Bills’ first two games of the season. That chemistry is part of what makes the Bills’ offense as lethal as it is, and has helped take Allen to the next level as a quarterback. On an appearance on The Rich Eisen Show on Tuesday, Diggs spoke about the connection with Allen and how he wants to be in Buffalo for … well, maybe forever. “(Allen…