If AI is going to stick around for the long term, investors might want to add these stocks to their portfolio.There are two sides to the artificial intelligence (AI) revolution. There is hardware, which includes data centers filled with advanced semiconductors designed to train AI models. Then there is software, which includes chatbots like OpenAI's ChatGPT, plus the expanding suite of cloud computing services that help businesses develop their own AI applications.Most Wall Street forecasts suggest AI will ...