Do not transform imports to use the Ember global for [email protected] and higher

[patocallaghan]

PR supersedes #382

So after some discussion in #dev-ember-js there's been a change of plan with regards deprecating Ember Global support.

Now, rather than using babel-plugin-ember-modules-api-polyfill's useEmberModule option to transform packages to their global equivalents and use an imported Ember, the plan is to no longer transform Ember package imports to use the Ember Global.

Source file

import Component from '@ember/component'; Component.extend();

Versions of ember-source less than 3.27.0-alpha.1

define("foo", [], function () {\n "use strict";\n\n Ember.Component.extend();\n});

Versions of ember-source greater than or equal to 3.27.0-alpha.1

define("foo", ["@ember/component"], function (_component) {\n "use strict";\n\n _component.default.extend();\n});