Colocation does not work with anonymous classes and class decorators

Moved from https://github.com/typed-ember/ember-cli-typescript/issues/1166 . There is a reproduction repo there.

cc @chriskrycho

Quote from Chris in Discord:

> I think it'll just need to tweak the transform so that if it's not a named class (BUT NAME YOUR CLASSES PEOPLE) it'll compile to
```js
import Component, { setComponentTemplate } from '@ember/component';
import template from './component.hbs';

export default setComponentTemplate(template, class extends Component {});
```