Add EESM to dq_to_abc_action_processor.py

[bhk11]

The machine is currently missing in the action processor and, thus, raise an error.

Code which is missing:

# dq_to_abc_action_processor for EESM
@DqToAbcActionProcessor.register_transformation(['EESM'])
class _EESMDqToAbcActionProcessor(DqToAbcActionProcessor):
    @property
    def action_space(self):
        return gymnasium.spaces.Box(-1, 1, shape=(3,))

    def __init__(self, physical_system=None):
        super().__init__('epsilon', physical_system=physical_system)

    def simulate(self, action):
        # Docstring of superclass
        advanced_angle = self._advance_angle(self._state)
        abc_action = self._transformation(action[:-1], advanced_angle)
        abc_action = np.append(abc_action, action[-1])
        normalized_state = self._physical_system.simulate(abc_action)
        self._state = normalized_state * self._physical_system.limits
        return normalized_state