The serialisation of soc to SoC should not occur in camel case if it is existing at the beginning of a field

[Jared-Newell-Mobility]

https://github.com/mobilityhouse/ocpp/blob/7e14b1664588e9f732f21fc5ff08369693385f35/ocpp/charge_point.py#L45-L60

consider this fictional field:

@dataclass
class Bidirectional:
    soc_battery: Optional[str] = None

when serialised;

results in SoCBattery when it should be socBattery

`@dataclass class Bidirectional: soc_battery: Optional[str] = None

def test_serialise():

expected = {'socBattery': None}

assert snake_to_camel_case(asdict(Bidirectional())) == expected`

test_v2x serialisation.py:38 (test_serialise) {'SoCBattery': None} != {'socBattery': None}

[Jared-Newell-Mobility]

Merged so will close