Get sentiment type for review analysis keywords

[breadadams]

Currently in the "analysis review" request we're extracting the top keywords that have determined the sentiment.

In addition to this we could get which sentiment each keyword represents. We can then use this to show a green/yellow/red highlight on them in the UI.

Example:

Review: "The product size is terrible, but the colors and style are great."

Keywords: "size" (negative), "colors" (positive), "style" (positive)