Improve DVSP benchmark: additional features, + more variety in start …

[BatyLeo]

Specific changes to DynamicVSP benchmark

• More features, up to 27
• More variety in start times
• Improve documentation

General (breaking) changes

• change evaluate_policy behaviour: when evaluated on a single environment, returns a vector of rewards and a vector of dataset (obe for each evaluated episode), evaluate averages and cancatenate datasets only when evaluated on multiple environments at once

[codecov]

Codecov Report

❌ Patch coverage is 96.55172% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/DynamicVehicleScheduling/features.jl	95.91%	4 Missing ⚠️

Files with missing lines	Coverage Δ
...namicVehicleScheduling/DynamicVehicleScheduling.jl	100.00% <100.00%> (ø)
src/DynamicVehicleScheduling/scenario.jl	91.66% <100.00%> (ø)
src/DynamicVehicleScheduling/static_vsp/parsing.jl	98.55% <100.00%> (+7.88%)	⬆️
src/DynamicVehicleScheduling/utils.jl	93.75% <100.00%> (+0.89%)	⬆️
src/Utils/policy.jl	92.68% <100.00%> (+2.43%)	⬆️
src/DynamicVehicleScheduling/features.jl	93.89% <95.91%> (+5.32%)	⬆️

... and 21 files with indirect coverage changes

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