Expose optional features

[bendemboski]

There is currently no public API for accessing the state of optional features at runtime, and this addon seems like the ideal place. Something like:

import { hasOptionalFeature } from 'ember-compatibility-helpers';

if (hasOptionalFeature('jquery-integration')) {
  // ...
}

I think this will either require, or else supercede emberjs/ember-optional-features#10, but either way, should address emberjs/ember-optional-features#10 (comment).

[rwjblue]

I totally agree.

[knownasilya]

Yeah, trying to write tests that work with classic and v4, and hitting this. Any ideas?