Возвращать массив BemCell из dependenciesOf

Чтобы не маппить вот так:
```js
const entities = graph.dependenciesOf(mergedDecl).map(BemCell.create);
```

Start at the graph dependenciesOf entry point shown in the issue and trace how its current results are produced. Confirm the desired return values are BemCell instances and update the relevant behavior so the shown call no longer needs BemCell.create; done when dependenciesOf directly returns the requested array.

Written by the indexing model from the issue text.