Add timers for state `b1_valid_height`
This introduce the new state `b1_valid_height_seg3_ok`, this state is entered
when the `EVENT_SEG3_HAS_TO_EXPIRE` event is triggered. `b1_valid_height_seg3_ok::dispatched_event_sensor_exit()`
now handled the good case. `b1_valid_height::dispatched_event_sensor_exit()` handles the too early case.
`b1_valid_height_seg3_ok::dispatched_event_seg3_too_late()` handles the too late case.