[DNMY] Add MOI wrapper for CCOpt

[frapac]

With this PR, we can solve a JuMP model with complementarity constraints using CCOpt:

using JuMP
using CCOpt
using MathOptComplements
using NLPModelsJuMP

function fletcher_leyffer_ex2_model()
    model = Model()
    @variable(model, z[1:2] >= 0)
    @objective(model, Min, z[1] + z[2])
    @constraint(model, z[2]^2 >= 1)
    @constraint(model, [z[1], z[2]] ∈ MOI.Complements(2))
    return model
end


model = fletcher_leyffer_ex2_model()
MathOptComplements.Bridges.add_all_bridges(model)
set_optimizer(model, CCOpt.Optimizer)
JuMP.optimize!(model)

The MOI wrapper is developed as a package extension. It requires MathOptComplements to reformulate automatically the mixed-complementarity constraints in MOI as strict complementarity.

cc @blegat