feature/#191 - added and computed possible product improvements

[monsieurtanuki]

Impacted files:

• api_getProduct_test.dart: added checks for getProductImprovements
• Product.dart: create enum ProductImprovement and Product.getProductImprovements()

[teolemon]

Is the scope the implementation of the Open Food Facts states ?

[peterwvj]

Minor but I'd avoid nested if structures like this, if possible. You could change it by adding something like

if (statestags == null) {
    return result;
}

[monsieurtanuki]

Thank you @peterwvj for your comment.
I agree with you, I'm a big fan myself of return, break or continue statements instead of elses (nested or not).
The thing is that I also had in mind #193, that will impact the very same method.
When I implement #193 (next week), I'll take your remark into account if still relevant.

[monsieurtanuki]

Is the scope the implementation of the Open Food Facts states ?

@teolemon If the question is for me, could you please elaborate on it?

[teolemon]

So far, the PR is implementing some of the available states (https://world.openfoodfacts.org/states, https://github.com/openfoodfacts/openfoodfacts-server/blob/main/taxonomies/states.txt)
So perhaps I would name them that way ?

[M123-dev]

Thanks @monsieurtanuki