Set to officially take office Wednesday morning, incoming Massachusetts Treasurer Deborah Goldberg plans to highlight in a speech efforts she will take to protect the state Lottery from competition and outline ways she will use her office to promote income equality and financial education. Goldberg, a former Brookline selectwoman whose family founded the Stop & Shop supermarket chain, will take the oath of office Wednesday, officially assuming control from Steven Grossman of the state’s pension investments and Lottery, as well as oversight of the state retirement board, the alcoholic beverages industry, debt management, and the Massachusetts School Building Authority.