US4_a-T2: recover performance metrics of the models

[AlbaGarciaRomo]

US4_a-T2: write a code that recovers the performance metrics in from the models, use all the metrics included in the spotlight library:

• MRR scores
• Precission and recall
• RMSE

Note that there is the version for this metrics for factorization and sequential models.

Estimated effort: 8