A leading child advocacy group challenged state leaders Wednesday to reverse escalating income and wealth inequality and provide tax relief for up to 90% of Connecticut by shifting tax burdens onto the state’s millionaires. Connecticut Voices for Children, which unveiled its program at the Capitol during its 19th annual state budget forum, put itself at odds with Gov. Ned Lamont, who blocked an income tax surcharge last spring on the investment earnings of wealthy households. The nonprofit policy think-tank, which has frequently weighed in on state finances since its founding in 1995, proposed two major state income tax relief efforts to pump $600 million annually into Connecticut’s middle class and working poor households — which together represent about 90% of the population….