Add axis argument to hierarchical clustering

[menoua]

Expected Behavior

naplib.visualization.hierarchical_cluster_plot should have an axis argument which would be one of ['x', 'y', 'xy'] that specifies which axis of the data matrix to perform hierarchical clustering on. If x, the dendrogram will be on the top of the data figure (the current default). If y, the dendrogram would be to the left of the data figure. If xy, there would be two dendrograms, one above and one to the left of data.