By Rodrigo Campos NEW YORK (Reuters) – The S&P 500 extended its rally on Monday to climb within 10 percent of its historic closing high, after Apple said it would pay a billion annual dividend and buy back stock. The benchmark index is now at its highest level since May 2008 and 10 percent below the record close of 1,565.15 set in October 2007. “This is the type of thing that typically...