Add more metrics

[Arkoniak]

Currently we are implementing only SqEucledian metric, but we can add support for all other metrics in Distances in the same manner as it is done in https://github.com/JuliaStats/Distances.jl/blob/master/src/generic.jl#L45

We should check the performance of course. It may be possible to use our own implementation for SqEucledian and generic Distances implementation for all other metrics.

[Arkoniak]

Yinyang and Coreset doesn't support other distance functions yet.