Add functions for exploring KEN embeddings

[LilianBoulard]

Fixes #495

[jovan-stojanovic]

Thanks! I added a few comments. In a second iteration, we can add also simple reproducible examples to illustrate how people can easily use these functions. Maybe we can also think of adding a separate section for Datasets on the website, as it is growing.

[LilianBoulard]

In a second iteration, we can add also simple reproducible examples to illustrate how people can easily use these functions.

Absolutely, and I think it could be included in the scope of #546 :)

[jovan-stojanovic]

One minor typo and LGTM!

[jovan-stojanovic]

Will merge when all the tests pass