Use AbstractConstrainedOptimizer as the parent type for all the constrained optimizers?

[abhigupta768]

Hey, I wanted to know if there has been discussion on using AbstractConstrainedOptimizer uniformly within Optim as the parent type for the constrained optimizers. Currently only Fminbox follows this where as SAMIN<:ZerothOrderOptimizer and IPNewton defines a new abstract ConstrainedOptimizer type.

If you agree I can put together the PR for this. Thanks.

[pkofod]

Hi! The very short ansewr is: no there hasn't been any real discussion around this. Can you flesh out your plan a bit? Thanks