Implement anticipative solvers for both stochastic benchmarks

[BatyLeo]

Implement parametric anticipative solvers for both ContextualStochasticArgmaxBenchmark and StochasticVEhicleSchedulingBenchmark.

[codecov]

Codecov Report

❌ Patch coverage is 78.94737% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...hasticVehicleScheduling/solution/algorithms/mip.jl	66.66%	4 Missing ⚠️
src/ContextualStochasticArgmax/policies.jl	75.00%	2 Missing ⚠️
...eduling/solution/algorithms/anticipative_solver.jl	80.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
...tualStochasticArgmax/ContextualStochasticArgmax.jl	93.93% <100.00%> (+0.83%)	⬆️
...icVehicleScheduling/StochasticVehicleScheduling.jl	85.71% <100.00%> (ø)
src/ContextualStochasticArgmax/policies.jl	84.61% <75.00%> (-15.39%)	⬇️
...eduling/solution/algorithms/anticipative_solver.jl	80.00% <80.00%> (ø)
...hasticVehicleScheduling/solution/algorithms/mip.jl	90.16% <66.66%> (-2.29%)	⬇️

... and 1 file with indirect coverage changes

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