CMI estimator for mixed data, with novel local permutation scheme

[kahaaga]

Zan et al. (2022) a new CMI estimator for mixed data and introduces the local adaptive permutation test, a variant of the LocalPermutationTest, which we already implement. The paper is https://www.mdpi.com/1099-4300/24/9/1234.

To implement this in a consistent manner, https://github.com/JuliaDynamics/StateSpaceSets.jl/issues/6 must be addressed first, so that we can annotate columns with tags "discrete"/"continuous"