Eval result dataframe is missing confidence scores of model predictions

[Timoeller]

Is your feature request related to a problem? Please describe.
When evaluating I want to see scores (confidence scores) associated with each model prediction.
With these scores, you can determine thresholds for only showing good model predictions. This is useful if you configure a search system for non technical endusers and want to filter predictions below a certain threshold.

Unfortunately, pipeline.eval results do not contain those scores.

Describe the solution you'd like
Please add the model prediction scores to the pipeline.eval results.
Tagging @sjrl since he experienced the same issue, as well as @tstadel because he might know a quick fix for this. :D