[HttpFoundation] JsonResponse::setEncodingOptions accepts also integer

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Tests pass?   | yes
| License       | MIT

Now you can also set encoding options like:
```php
$response->setEncodingOptions(JSON_UNESCAPED_UNICODE | $response->getEncodingOptions());