Stock trader Ivan Boesky, who served prison time in connection of an insider trading scandal and was part of the inspiration for the Oliver Stone movie “Wall Street,” has died. He was 87. Boesky cooperated with a government investigation that exposed one of the largest insider trading scandals in the history of Wall Street. He had been considered one of the richest and most influential risk-takers on Wall Street. Once implicated in insider trading, Boesky secretly taped three conversations with Michael Milken, the so-called “junk bond king” whose work with Drexel Burnham Lambert had revolution…