Function to compute the Calinski-Harabasz index for a set of clusters
ch_index(ncs, class_vec, clusters, q = seq(0.1, 0.9, by = 0.1))A numeric value representing the Calinski-Harabasz index for the clusters
Vector of non-conformity scores
Vector of class labels
List of clusters, where each element is a vector of class labels assigned to that cluster
Quantiles to use for the qECDFs, default is a sequence from 0.1 to 0.9 in steps of 0.1