Allow to report multiple metrics at once.

[cyberang3l]

To my understanding so far, if I want to run a simulation with 50000 runs and get the results for hist_max_cong, hist_acc_band, and sum_max_cong, I should run the simulation 3 times. That makes it 150000 runs instead of 50000. When you want to run thousands of simulations, this adds up quickly and the simulations may take forever.

We should have an option to provide information from more metrics at once or provide all of them anyway and let the user choose what they need?