Change color map / color assignment

## Use Case

Requested by @MFarhadloo25 and @vianamp ! Majid would like to be able to switch the colormap that's used to color numeric features, similar to the current colormap selections that TFE has.

They specifically requested several continuous color maps and some diverging maps. TFE has existing color gradients that have been previously vetted by me for colorblind-friendliness.

~~Majid says he'd like to have some of the functionality of matplotlib. This includes changing the size of points and the shape. Most notably, Majid would like to be able to apply a categorical-style color map (e.g. glasbey ramps) to an integer feature column.~~ (see #236)

## Solution

_Please describe your ideal solution_

## Alternatives

_Please describe any alternatives you've considered, even if you've dismissed them_