Change of format of saved predictions

[BenediktStuhrmann]

We only need the id (of the sample in the respective dataset) and the prediction of the model. (remove question, context, reference_aswers etc.)

The prediction of the query endpoint seems to always consist out of:

"prediction_output" :{
        "output":"Don Mueller",
        "output_score":0.2426052987575531
}

So it would make sense to simply save it like that.

[BenediktStuhrmann]

Basically: Instead of using PredictionAnswer for saving, use PredictionOutput => see here.