NEW YORK — The Federal Reserve should start raising interest rates next month to help rein in too-high inflation, Federal Reserve Bank of New York President John Williams said Friday. But he added that the rate hikes may not have to begin with as big a bang as some have suggested. With inflation at its hottest level in two generations, the Fed is widely expected to seek to cool the economy by raising its benchmark short-term interest rate from its record low of nearly zero, where it’s been throughout the pandemic.