feat: implement some of the integrator interface for `NullODEIntegrator`#1163

ChrisRackauckas merged 2 commits intoSciML:masterSciML/DiffEqBase.jl:masterfrom

AayushSabharwal:as/null-integrator-interfaceAayushSabharwal/DiffEqBase.jl:as/null-integrator-interfaceCopy head branch name to clipboard