Create explainable user model classes

[IKostric]

Simple Explainable user model based on tags.

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[IKostric]

Assuming that UserPreferences contains item-based preferences, there is a missing step of inferring preferences for tags. That should take place in this class (by talking to the movie DB).

Since we have attribute preferances readily available, we can start with those. Later, we can expand to item-based preferances.