[TASK] Domain model relation tweaking
[FEATURE] Event & activity demo setup CommandController

Get some demo data for Events with activities

COMMAND:
  scoutrace.scoutrace:setup:demo

USAGE:
  ./flow setup:demo [<options>]

OPTIONS:
  --events             Number of demo events to create (default 10)
  --activities         Number of demo activities to create per event (default
                       10)