Implemented CVI List

The ClusterValidityIndices.jl package has the following CVIs implemented:

• CH: Calinski-Harabasz.
• cSIL: Centroid-based Silhouette.
• DB: Davies-Bouldin.
• GD43: Generalized Dunn's Index 43.
• GD53: Generalized Dunn's Index 53.
• PS: Partition Separation.
• rCIP: (Renyi's) representative Cross Information Potential.
• WB: WB-index.
• XB: Xie-Beni.

The exported constant CVI_MODULES also contains a list of these CVIs for convenient iteration.

Each of the CVIs are instantiated with the empty constructor, i.e. CH() and run with get_cvi!. For details and usage, see the Package Guide.