speedgoat: Rework display_counters without explicit ANSI

Have to be reworked on top of !6157 (merged)

Related to #4234 (closed)

Close #4206

Tested with

DEMO_SESSION [2]: class MyCounter:
             ...:     def __init__(self, counter):
             ...:         self._counter = counter
             ...:     @property
             ...:     def name(self):
             ...:         return self._counter.name
             ...:     @property
             ...:     def unit(self):
             ...:         return self._counter.unit
             ...:     @property
             ...:     def value(self):
             ...:         return self._counter.raw_read
             ...: a = MyCounter(diode1)
             ...: b = MyCounter(diode2)
             ...: from bliss.controllers.speedgoat.speedgoat_utils import SpeedgoatUtils
             ...: SpeedgoatUtils.display_counters([a, b])

|       Counter        |        Value         |    Unit    |
|----------------------+----------------------+------------|
| diode1               |          61.92000000 |            |
| diode2               |          88.28000000 |            |