Switch to horizontal type hierarchy

[BatyLeo]

Instead of having Dynamic <: Stohcastic <: Static, now we have:

• main AbstractBenchmark type
• AbstractStaticBenchmark <: AbstractBenchmark for static benchmarks
• AbstractStochasticBenchmark <: AbstractBenchmark for (contextual) staochastic benchmarks
• AbstractDynamicBenchmark <: AbstractBenchmark for dynamic benchmarks

[codecov]

Codecov Report

❌ Patch coverage is 97.46835% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Utils/interface/stochastic_benchmark.jl	94.44%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/Argmax/Argmax.jl	100.00% <ø> (ø)
src/Argmax2D/Argmax2D.jl	100.00% <ø> (ø)
src/DynamicAssortment/DynamicAssortment.jl	100.00% <ø> (ø)
src/FixedSizeShortestPath/FixedSizeShortestPath.jl	94.00% <ø> (ø)
src/PortfolioOptimization/PortfolioOptimization.jl	92.30% <ø> (ø)
src/Ranking/Ranking.jl	100.00% <ø> (ø)
src/SubsetSelection/SubsetSelection.jl	100.00% <ø> (ø)
src/Utils/Utils.jl	100.00% <ø> (ø)
src/Utils/interface/abstract_benchmark.jl	100.00% <100.00%> (ø)
src/Utils/interface/dynamic_benchmark.jl	100.00% <100.00%> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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