Add probability-based morphometrics module

[noshita]

Is your feature request related to a problem? Please describe.
確率分布ベース形態測定学向けのパッケージが無い．

Describe the solution you'd like
Adrian et al. 2009のフレームワークが利用できるようにしたい．

Describe alternatives you've considered
存在しない．

Additional context
特になし．