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 {});
```

從已移動 issue 中連結的重現儲存庫開始，檢查帶有裝飾器的匿名類別的轉換路徑。當重現程式碼使用所示的 setComponentTemplate 形式編譯成功，且匿名類別的併置正常運作時，即表示完成。

由索引模型根據 Issue 內容生成。