Issue title: provide a way to fetch records in a specific language only
 Issue body: i'v integrated the package with an application that i'm working on, and multi-language fields are returned like: 
```json 
{
   title: {
      en: "That's a title in english",
      ar: "That's a title in arabic."
   }
}
```
and that's okey.

but, what i really want is something like:
```json 
{
   title: "That's a title in english"
}
```
with specifying the target wanted language "en" as a dynamic thing like a query param or something sent in Headers. so if switched to "ar" for example the response would look like:

```json 
{
   title: "That's a title in arabic"
}
```

i didn't like the way i achieved that using loops and so much code. is there any short-handed way to do that with that package?
 Comments: 
 Comment 0: Hello @adnane-ka 

I imagine you can use this:
https://github.com/spatie/laravel-translatable#automatically-display-the-right-translation-when-displaying-model
 Comment 1: > Consider using mutators for automatically retrieving models with strings already localized. Check this similar issue: [#320 (comment)](https://github.com/spatie/laravel-translatable/issues/320#issuecomment-1017410024)

Thanks for the inspiration @anibalealvarezs. i did that using mutators. 
it did not seem to me logical to change the whole application locale to a target language just to fetch records in that language. so i did a couple of changes to that considering fetching from an API. 
```php 
public function getTitleAttribute($value)
    {
        # fetch target language from request 
        $locale = request()->has('locale') ? request()->get('locale') : 'en';
        
        # make sure that target language is available 
        $locale = in_array($locale ,['en' ,'ar']) ? $locale : 'en';

        return json_decode($value)->{$locale};
    }
```
now i can send a GET request to ``/api/articles?locale=en`` to see results in english !

and everything is working really perfect! 

Thanks!
{'source': 'GithubIssues', 'repo_name_with_owner': 'spatie/laravel-translatable', 'issue_id': 1124912920, 'repo_stars': 1873.0}