Convert Model scopes to Query Builder class

[Gummibeer]

What would you like to do?
The new task should convert scope methods on Models to Query-Builder classes.

https://twitter.com/RienvanVelzen/status/1434522901714190346

Before/After code snippets

class Article extends Model
{
    public function scopePublished(Builder $builder)
    {
        return $builder->whereNotNull('published_at');
    }
}

class ArticleBuilder extends Builder
{
    public function published(): self
    {
        return $this->whereNotNull('published_at');
    }
}


class Article extends Model
{
    public function newEloquentBuilder($query): Builder
    {
        return new ArticleBuilder($query);
    }
}

[jasonmccreary]

@Gummibeer, sorry for the delay on this. Been focused on other things. Now that we're ready for the Laravel 9 release, we'll be working to tame all these open issues. 👍