SPRINGFIELD — It’s not a comprehensive budget solution.But after almost exactly a year with no spending plan, state lawmakers are on track to buy themselves more time by approving a temporary budget package that keeps schools open, funds many government services and provides extra relief for Chicago schools.A full spending bill that makes appropriations from the state’s checkbook account was still forthcoming as of press time.But early versions aimed to cover at least some costs through Dec. 31 of this …