By Ann Saphir WASHINGTON (Reuters) – The Federal Reserve on Wednesday is expected to raise interest rates by half of a percentage point and announce the start of reductions to its $9 trillion balance sheet as U.S. central bankers intensify efforts to bring down high inflation. Fed policymakers have widely telegraphed a double-barreled decision that would lift the Fed’s short-term target policy rate to a range between 0.75% and 1%, and set in motion a plan to trim its portfolio of Treasuries and mortgage-backed securities (MBS) by as much $95 billion a month. The policy statement is due to be r…