Gets Forwards for a list of currency pairs

Forward rates are provided in 80+ currencies against the U.S. dollar, British pound, and euro. Forward quotes are provided by Reuters and coverage is determined by the amount of reliable currency trading in a particular currency. Bid, offer, and mid rates are available for 11 `forwardPeriod` periods - Overnight, Tomorrow Next, 1 Week (Spot Week), 1 month, 2 month, 3 month, 6 month, 9 month, 1 year, 2 year, 5 year. All identifiers have spot rates, but not all identifiers have forward rate data.