NEW YORK — Wall Street closed out a solid November with a broad market rally Wednesday after the head of the Federal Reserve said the central bank could soon begin easing up on its aggressive interest rate increases aimed at taming inflation. Fed Chair Jerome Powell, speaking at the Brookings Institution, reaffirmed that the central bank could begin moderating its pace of rate hikes as soon as December, when its policymaking committee is due to hold its next meeting. “We have a risk management b