Added the feature in the library and in the webapp so that when we test from the webapp, it return the predicted element, and if it was correct or no

This commit add
- the fact that the validator return you the correct prediction
- the confusion matrix (for the moment, with the labels as numbers, and whithout light mode) in the test page statistics
- the confusion matrix is extendable (it works not only for boolean, but also for multi classification)

- Move the confusion matrix into her own space
- Add dark mode support for the confusion matrix
- Add the labels as the title of the confusion matrix, instead of "1" or "2" (the labels have to be predicted at least once)