Kuviz creation integration

[simon-contreras-deel]

Solves a part of #674

The objective is to integrate the new Kuviz class from carto-python to use it in publish method of "sharing visualizations" project. In this PR we are only integrating the create method, the rest will be integrated into other PR.

The "Kuviz publish" PR will be merged into this one #718 finishing the publication process

[andy-esch]

👀

[andy-esch]

Looks great, just left a few minor comments.

On a high level, this class will largely be hidden from the user, correct? Will it be inside Map().publish()? How do you envision user-facing API for creating, updating, etc.?

Part of the reason for asking this is that I think we should potentially change error messages from Kuviz -> cartoframes visualizations or something like that so we're not introducing a term that's more of an implementation detail.

[simon-contreras-deel]

About how Kuviz is used, the following PR resolves the publication: #718

list kuvizs:

kuvizs = Kuviz.all()

update / delete methods:

# from publish
kuviz** = map.publish(...)
kuviz.update(...)

# from list
kuvizs = Kuviz.all()
kuvizs[0].delete(...)

Kuviz and Visualization are not exactly the same. Kuviz are a subset of visualizations, but with different flows and final results