Add testing models on indiviual sessions

[Joloco109]

Add testing models on indiviual sessions and plot aggregated versions of this.

• [x] Add a parameter, that filters the trials used in test_models.py
• [x] Add a rule testing models on indiviual sessions
• [x] Add the capacity for plot_performace_time_aggr.py to plot with different x axis
• [x] Add a rule, plotting model performance over session date_time