Adding k-medoids #5

Job	Run time
Security audit	2m 46s
Build documentation	13s
Build and Test (macOS-latest, stable)	20s
Build and Test (ubuntu-latest, stable)	15s
Build and Test (ubuntu-latest, nightly)	21s
Build and Test (ubuntu-latest, beta)	22s
Build and Test (windows-latest, beta)	25s
Build and Test (windows-latest, stable)	18s
Build and Test (macOS-latest, beta)	17s
	5m 17s

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