Evaluate script should produce plots and tables

ptbench evaluate should produce plots and tables summarising results:

• Plots:
  1. Histogram distributions of true-positive/true-negative scores
  2. ROC curve (Sensitivity on the vertical axis, "1-Specificity" on the horizontal axis)
  3. Precision-Recall curve (Precision on the vertical axis, Recall on the horizontal axis)
• Table - 1 single table that summarises the most important measures
  1. Dataset name (within the split)
  2. Threshold applied
  3. If the threshold was chosen a priori or a posteriori
  4. Check further elements here: https://gitlab.idiap.ch/biosignal/software/deepdraw/-/blob/master/src/deepdraw/utils/table.py