Returns UnitId.cycleId of given index.
UnitId.az is used as input - so result is not case sensitive and without numbers.
Set digitOffset to specify minimum length of final result.
Returns UnitId.cycleId of current microsecondsSinceEpoch and adds 4 random chars to end of String.
UnitId.aZn is used as input - so result is case sensitive and with numbers.