A stone-faced Mayor Eric Adams pleaded not guilty in Manhattan federal court Friday during his historic arraignment on bombshell federal corruption charges.Hizzoner — who is the first sitting New York City mayor to be criminally indicted — stared blankly ahead as the judge fired off the slew of conspiracy, wire fraud and bribery allegations he is facing.“I am not guilty, your honor,” Adams told the judge.His plea came just hours after the mayor surrendered himself to the feds at the courthouse in Lower Manhattan Friday morning....