Unable to fetch relationships withThrashed

[galzetta]

Description:

withThrashed doesn't work at all.

Steps to reproduce

1. Define an entity relationship like so:

   public function something()
       {
           return $this->belongsTo(Something::class)->withThrashed();
       }
   

2. Call this method

Expected behaviour

The results are returned and they include thrashed objects.

Actual behaviour

An exception is raised:

BadMethodCallException in Builder.php line 2450: Call to undefined method Jenssegers\Mongodb\Query\Builder::withThrashed()