By THÉRÈSE MARGOLIS More than 3,000 Mexicans — including three billionaires and a former close advisor to President Andrés Manuel López Obrador (AMLO) — have been implicated in the so-called Pandora Papers, a trove of more than 11.8 million documents collected by the International Consortium of Investigative Journalists (ICIJ) that exposes secretive offshore accounts that allowed government leaders, financial tycoons