Setup growthbook for A/B Testing features

[josancamon19]

Is your feature request related to a problem? Please describe.
In order to have data to determine between multiple options for colors, tags, prompts, features, we need to have a robust AB Testing system in-place.

Describe the solution you'd like
The app should initialize GrowthBook for flutter and should allow to have if statements that determine if feature is on or off, or which of the options from a feature/variation based on Growthbook rules correspond to the user.

(ALL THIS MUST BE STILL 100% ANONYMYZED)