feat: add automatic variable discovery for `OptimizationSystem`#3243

ChrisRackauckas merged 1 commit intoSciML:masterSciML/ModelingToolkit.jl:masterfrom

AayushSabharwal:as/optsys-discover-variablesAayushSabharwal/ModelingToolkit.jl:as/optsys-discover-variablesCopy head branch name to clipboard