Added Custom distribution for interpersonal distances
Closes https://gitlab.cern.ch/cara/cara/-/issues/254
Added Custom distribution to the interpersonal distances with bounds on 0.5 and 2m.
Distribution without artificial increase - mean = 0.985 m, std = 0.341 m
Description and plot in https://gitlab.cern.ch/cara/cara/-/merge_requests/346#note_5510732