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Distances to sets for MathOptInterface

Results 9 MathOptSetDistances.jl issues
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Inplace versions for projection_on_set, projection_gradient_on_set

Add closed-form norm ball projections

I don't know that this actually belongs here. The `is_feasible(constraint_set::MOI.AbstractSet, point)` probably does. but all the stuff that wrangles through a JuMP.Model probably doesn't. But here is the code that...

Motivated by https://github.com/matbesancon/MathOptSetDistances.jl/pull/29 From @joaquimg: This might be the first version of having two distances. Because a very common distance is the euclidean. But euclidean requires the projection first. Our...

We defined derivatives of projections, it might be interesting to have derivatives of MOI functions, especially `ScalarAffineFunction, VectorAffineFunction`

I assume lots of assumptions here are relying on real values `v` and real-valued sets `s`. Solvers are starting to support complex, so should we

This makes sense only for continuous sets I think: adding a trait for sets that have an interior

Suppose that you have a set defined as: `x | x >= 0 & f(x) = 0}`, this implies f(x) cannot be computed if `x >= 0`. A first idea...