feat(dephy): Added torque_constant parameter to DephyActuator. This allows the users to override the motor torque constant (NM_PER_AMP) when constructing DephyActuator in the control script

feat(dephy): Added torque_constant parameter to DephyActuator. This allows the users to override the motor torque constant (NM_PER_AMP) when constructing DephyActuator in the control script #506