SPRINGFIELD — Chicago’s mayor-elect on Wednesday attempted to dispel the often-contentious relationship between the nation’s third-largest city and the rest of the state, telling a joint session of the General Assembly, “There’s more than enough for everybody in the state of Illinois.”Brandon Johnson, whose victory in the mayor’s race this month provided a welcome boost for progressives, played to his fellow Democrats, who hold supermajorities in both the House and Senate. He …