Stripe.js bindings for dart2js

This package is in a very early stage so be cautious to use it in production.

Contribution

The package is ported manually by taking a look into StripeJS docs and the API Reference.

It uses js package that allows to access the Stripe JS from dart. While the api enpoints use the package, most js objects are pure dart freezed classes that make use of https://api.dart.dev/stable/2.18.4/dart-js_util/jsify.html and https://api.dart.dev/stable/2.18.4/dart-js_util/dartify.html. While these methods are a bit more expensive, using pure dart allows to easily test these classes and ensure the follow the expected schema