Add user id to the ApprovedPredictions

[omranlm]

Is your feature request related to a problem? Please describe.
The class ApprovedPredictions(models.Model) doesn't have a reference to the user who created the record (user who accepted the predictions).

Describe the solution you'd like

We need to have the user ID of the user who accepted the predicted feature for analysis purposes.

Describe alternatives you've considered
We might not need to add that in the API since we have the authentication, we should be able to know the user ID but we need to save in the database in the core_approvedpredictions table