Add relative importance through dominance analysis

[raoulcollenteur]

Describe the proposed feature

In this article we used dominance analysis to estimate the relative importance of the contributions from the different stresses. This can be used to make those pie-graphs. The article can be found here: https://file.lianxh.cn/PDFTW/budescu1993.pdf

Expected usage

ps.stats.relative_importances(ml)

can then return:

A dataframe with the relative importances for each stress. The method should probably take the tmin tmax arguments.

Additional context

Scripts to get started are available here: https://zenodo.org/records/7494481