[12.x] Add Model::query($fetchModes) syntactic sugar

[shaedrich]

Follow-up to #54734 resp. #54443

Based on comments https://github.com/laravel/framework/pull/54734#issuecomment-2672501873 and https://github.com/laravel/framework/pull/54443#issuecomment-2644726839

You can then do

User::query([PDO::FETCH_UNIQUE])->select(['id','users.*'])->get();

without an additional call to fetchUsing()

As bert-w has pointed out, this only applies to queries created via a model's query() method (or other public methods in that chain), so it may not be an alternative for all cases.