Added energy value at each iteration printing

  const auto energy = result.get<double>("energy");

  auto finalCircuit = result.getPointerLike<CompositeInstruction>("circuit");

  printf("\n%s\nEnergy=%f\n", finalCircuit->toString().c_str(), energy);

  const auto energyAtStep = result.get<std::vector<double>>("exp-vals");

  std::cout << "QITE energy: [ ";

  for (const auto &val : energyAtStep) {

    std::cout << val << " ";

  }

  std::cout << "]\n";

}

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