feat: simplify initialization systems with `fully_determined=true` if possible#3235

ChrisRackauckas merged 5 commits intoSciML:masterSciML/ModelingToolkit.jl:masterfrom

AayushSabharwal:as/init-fully-determinedAayushSabharwal/ModelingToolkit.jl:as/init-fully-determinedCopy head branch name to clipboard