Add NonlinearLeastSquaresProblem dispatch for modelingtoolkitize

[pao]

Is your feature request related to a problem? Please describe.

There is not currently a dispatch for NonlinearLeastSquaresProblem in the modelingtoolkitize function, so those kinds of problems cannot be...toolkitized?

julia> @mtkbuild sys = modelingtoolkitize(safehouse.prob)
ERROR: MethodError: no method matching modelingtoolkitize(::NonlinearLeastSquaresProblem{…}; name::Symbol)

Closest candidates are:
modelingtoolkitize(::OptimizationProblem; kwargs...)
@ ModelingToolkit C:\julia\packages\ModelingToolkit\kByuD\src\systems\optimization\modelingtoolkitize.jl:6
modelingtoolkitize(::SDEProblem; kwargs...)
@ ModelingToolkit C:\julia\packages\ModelingToolkit\kByuD\src\systems\diffeqs\modelingtoolkitize.jl:173
modelingtoolkitize(::ODEProblem; kwargs...)
@ ModelingToolkit C:\julia\packages\ModelingToolkit\kByuD\src\systems\diffeqs\modelingtoolkitize.jl:6
...

Describe the solution you’d like

Please add the missing dispatch (it sounds like we already know what needs doing here per a Slack discussion.)

cc @ChrisRackauckas