Former U.S. Supreme Court justice John Paul Stevens was a contrarian, a prolific writer and the “conscience” of the U.S. Supreme Court. He wasn’t afraid to speak his mind.The third longest-serving high court justice and native Chicagoan called for a repeal of the Second Amendment, questioned Brett M. Kavanaugh’s fitness for the bench and pushed back on President Donald Trump’s criticisms of the judiciary. And that was just in the year preceding his death.But Stevens, who died in July at age 99 …