Handle Scout pagination arguments

[fredmarmillod]

• Added or updated tests
• Added Docs for all relevant versions

Related Issue/Intent

Resolves #592

Changes

// Nuwave\Lighthouse\Schema\Directives\Fields\PaginateDirective

protected function getPaginatedResults(array $resolveArgs, int $page, int $first): LengthAwarePaginator
{
    ...

    if ($query instanceof \Laravel\Scout\Builder) {
        return $query->paginate($first, 'page', $page);
    }

    return $query->paginate($first, ['*'], 'page', $page);
}

Please review my test case, it could be simpler I think.

[spawnia]

Great job on this @xahs

Thanks!