By Howard Schneider and Ann Saphir WASHINGTON (Reuters) -The Federal Reserve raised interest rates by half a percentage point on Wednesday and projected at least an additional 75 basis points of increases in borrowing costs by the end of 2023 as well as a rise in unemployment and a near stalling of economic growth. The U.S. central bank’s projection of the target federal funds rate rising to 5.1% in 2023 is slightly higher than investors expected heading into this week’s two-day policy meeting and appeared biased if anything to move higher. Only two of 19 Fed officials saw the benchmark overni…