DataSample interface redesign

[BatyLeo]

Breaking changes:

• Rename 'info' field to 'context', which is now reserved to maximizer kwargs
• Add a new 'extra' field, which stores any additional information

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Utils/data_sample.jl	95.65%	1 Missing ⚠️

Files with missing lines	Coverage Δ
...rc/DynamicVehicleScheduling/anticipative_solver.jl	100.00% <100.00%> (ø)
src/DynamicVehicleScheduling/plot.jl	97.04% <100.00%> (ø)
src/Utils/interface.jl	100.00% <100.00%> (ø)
src/Utils/policy.jl	92.85% <100.00%> (ø)
src/Utils/data_sample.jl	93.10% <95.65%> (-6.90%)	⬇️

... and 2 files with indirect coverage changes

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