Enhance stochastic interface

[BatyLeo]

Yet another rework of the interface, the goal is to accomodate more cases while keeping a simple and intuitive API:

• generate_anticipative_solver as a callable factory
• generate_parametric_anticipative_solver, optional method to solve a scenario with a perturbation in the objective. USeful to implement mirror descent algorithms.
• new generate_instance method, called by a default implementation of generate_sample
• Updated documentation: separeted into two pages, one for users that just want to use existing benchmarks, and one for users wanting to implement their own benchmark

[codecov]

Codecov Report

❌ Patch coverage is 56.45161% with 27 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Utils/interface.jl	52.94%	16 Missing ⚠️
...namicVehicleScheduling/DynamicVehicleScheduling.jl	54.54%	5 Missing ⚠️
src/DynamicVehicleScheduling/environment.jl	0.00%	4 Missing ⚠️
src/DynamicVehicleScheduling/scenario.jl	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/DecisionFocusedLearningBenchmarks.jl	100.00% <ø> (ø)
src/DynamicAssortment/DynamicAssortment.jl	100.00% <100.00%> (ø)
src/FixedSizeShortestPath/FixedSizeShortestPath.jl	94.00% <100.00%> (+0.12%)	⬆️
src/Maintenance/Maintenance.jl	100.00% <100.00%> (ø)
src/PortfolioOptimization/PortfolioOptimization.jl	91.89% <100.00%> (+0.22%)	⬆️
...icVehicleScheduling/StochasticVehicleScheduling.jl	100.00% <100.00%> (ø)
src/Utils/Utils.jl	100.00% <ø> (ø)
src/DynamicVehicleScheduling/scenario.jl	92.00% <0.00%> (ø)
src/DynamicVehicleScheduling/environment.jl	75.67% <0.00%> (-9.18%)	⬇️
...namicVehicleScheduling/DynamicVehicleScheduling.jl	81.48% <54.54%> (-18.52%)	⬇️
... and 1 more

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