Add "whereNotIn" native support to Meilisearch, Database and Collection engines

[guestpectacular]

I have introduced the "whereNotIn" support to the Scout query builder to be used with Meilisearch, to continue with elegant and readable code following Laravel's coding standards:

Eliminates the need for previous hackish workarounds, example:

Model::search('foo', function ($engine, $query, $options) { 
  $options['filter'] = 'id NOT IN ['.implode(',', [1,2,3]).']';
  return $meilisearch->search($query, $options);
})->get()

Transformed into:

Model::search('foo')->whereNotIn('id',[1,2,3])->get()

I apologize for not including Algolia support, since its paid service and I don't have an active account with them to write and run all tests.

Best
Edgar Pimienta

[driesvints]

@guestpectacular Thanks! Can you also send in a PR to the docs for this?

[guestpectacular]

Sure, it's done @driesvints