Support non-spatial blocking?

[mikemahoney218]

Someone brought this up in a workshop -- there's a lot of places that blocked CV can be useful (the Roberts 2017 paper discusses several). It might be useful to support blocking (temporal, phylogenetic) and non-spatial clustering (someone provides a distance matrix, we use a knockoff of spatial_clustering_cv to break it into folds).

[mikemahoney218]

clustering_cv <- function(data, coords, cluster_function = "kmeans", distance_function = "dist")

[github-actions]

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