Add deck.gl Scatterplot layer component on top of BaseMap

[mendozaline]

A new deck.gl ScatterplotLayer component needs to be created.

This should layer on top of our existing BaseMap component.

Todo:

• [x] Add deck.gl as a dependency
• [x] Add the ScatterplotLayer component
• [x] Add unit tests
• [x] Update the ScatterplotLayer story

[mendozaline]

Closing this and will add unit tests per #147 .

[mendozaline]

This issue was finished by #160.