[Enrichr_Scatterplot_Appyter]: Include library term clusters

[u8sand]

The terms in the Enrichr libraries often cluster together, those terms will represent common themes in the given background.

The Enrichr Scatterplot Appyter tabular output is currently no more informative than the original results, while the plot shows some useful information.

It would be useful to include cluster labels for the enriched terms in the output table so that individuals can discern from the groupings, what the enrichr group represents.

To do this, clusters could be pre-computed when the UMAPs are constructed using the original dimensionality.

Potentially it'd also be useful for people to include coordinates in this table so people can reproduce and augment the figure as desired.