Support ES6 and JavaScript

[kamilkisiela]

Prepare ReflectiveInjector for JavaScript and ES6. GraphQL Modules are not ready yet.

class Http {}

class Service {
  static get parameters() {
    return [Http];
  }

  constructor(http) {
    console.log(http)
  }
}

[theguild-bot]

The latest changes of this PR are not available as alpha, since there are no linked changesets for this PR.

$ yarn pr

Describe changes introduced in this Pull Request by running the above command.