Implement VUS metrics

[LouisCarpentier42]

Implement the Volume Under The Surface (VUS) metrics [1]. Both VUS-ROC and VUS-PR should be implemented. These metrics extend traditional AUC-ROC and AUC-PR to also take the temporal nature of time series into account.

[1] Paparrizos, John, et al. "Volume under the surface: a new accuracy evaluation measure for time-series anomaly detection." Proceedings of the VLDB Endowment 15.11 (2022): 2774-2787.