[ENH] sync skpro and sktime probabilistic metrics modules

[fkiraly]

We need to sync the skpro and sktime probabilistic metrics modules.

Synchronization points:

• ensure handling of weights like in sktime, e.g., via _groupby_dot
• ensure consistent output type handling, e.g., in evaluate
• possibly for later: consider vectorization over MultiIndex entries - this is required for rebasing sktime proba metrics on skpro
• ensure new probabilistic metrics in sktime are also present in skpro, e.g., calibration or sharpness