[V5] Set model fields to hidden

[felipesdias]

I think we should have the property hidden in ColumDecorator.

Use case:
By default I always hide the "updatedAt" and "createdAt" fields, but in specific cases I would like them to be serialized, setting serializableAs to null, this behavior is not possible.

suggestion:

@column ({hidden: true})
public createdAt: DateTime;

model.serialize ({
  fields: {
    show: ['updatedAt']
}