Validator for transformation update model

[pablo-de-andres]

Logic could be added to check that the updates being sent are logical:

class TransformationUpdateModel(BaseModel):
    state: TransformationState

    @validator("state")
    def check_state(cls, v):
        if v not in [TransformationState.RUNNING, TransformationState.STOPPED]:
            raise ValueError(
                f"The state of the transformation must be either \
                {TransformationState.RUNNING} or {TransformationState.STOPPED}"
            )
        return v