Add models to AppServiceProvider.php Relation::morphMap

[inikoo]

We can skip xxxStats because they are will never be inside a morph (I hope)

We will separate then (with comments) in the modules as in app/Model folder

we need to do this so we can refactor code later on with out breaking the app (Old model path is stored in the database)

[inikoo]

@itzArtha we need to make all models that can but morphed by Universal search are in that array, no need to put Stats models or pivot models.

Would be nice is we kind of separate by module using comments