NEW YORK/LONDON, April 29 : The dollar rose broadly against major peers on Wednesday as investors awaited a U.S. Federal Reserve policy decision, with markets also on edge over an Iran war that shows little sign of easing. Caution prevailed ahead of a wave of major central bank meetings over the next two days, including decisions from the European Central Bank, the Bank of England and the Bank of Canada.     Investors are also eyeing a packed earnings slate, with Amazon, Microsoft and Meta set