“Google became the gateway to the internet by perfecting its search engine. But after a quarter century, the tech giant is betting that the future of search will be artificial intelligence. On Tuesday, Google said it was introducing a new feature in its search engine called A.I. The tool will function like a chatbot, allowing people to start a query, ask follow-up questions and use the company’s A.I. Mode, Google is essentially trying to disrupt its traditional search business before upstart A.I.