Add additional scripts to plot reconstructed values of the regression task

[BastienLacave]

Currently the additional scripts only feature plotting the particle classification from the DL2 predictions.
I would like to also plot reconstructed values of the regression tasks, i.e. energy and angular resolutions.

[TjarkMiener]

Also auc per energy bins would be an interesting control plot. Therefore we always need to store the true energies, as well as for the angular resolution control plot. We could also add the gammaness histograms per energy bins as a control plot.