Improve surrogate evaluation

[robin-janssen]

Rework of the surrogate evaluation procedure, switch many evaluations to log-space metrics and add new plots

[codecov]

Codecov Report

❌ Patch coverage is 85.35565% with 35 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
codes/benchmark/bench_fcts.py	88.83%	24 Missing ⚠️
codes/benchmark/bench_utils.py	55.00%	9 Missing ⚠️
...surrogates/AbstractSurrogate/abstract_surrogate.py	50.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
...es/surrogates/LatentNeuralODE/latent_neural_ode.py	66.24% <ø> (ø)
codes/tune/optuna_fcts.py	68.66% <ø> (+7.93%)	⬆️
...surrogates/AbstractSurrogate/abstract_surrogate.py	61.51% <50.00%> (-0.40%)	⬇️
codes/benchmark/bench_utils.py	52.64% <55.00%> (+1.01%)	⬆️
codes/benchmark/bench_fcts.py	91.72% <88.83%> (+8.02%)	⬆️

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