text: Title: Add K-Medoids Support
  Body: * igel version: 0.3.1
  * Python version: 3.6.9
  * Operating System: Ubuntu 18.04 LTS running as a Linux Subsystem on WSL2
  
  ### Description
  Adding support for K-Medoids Clustering from the sklearn_extra library. 
  This clustering method would be useful for median-based distance metrics in clustering, because it reduces the impact of outliers on finding new central points, and calculates dissimilarities (pairwise) to all the objects in the cluster, creating a more centered cluster center point.
  
  ### What I Did
  Currently working on it. Will submit PR shortly.
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