feat: [discoveryengine] add Natural Language Query Understanding fields and messages to DiscoveryEngine request, response, and datastore messages#7238

quirogas merged 2 commits intomaingoogleapis/google-cloud-node:mainfrom

owl-bot-copy-packages-google-cloud-discoveryenginegoogleapis/google-cloud-node:owl-bot-copy-packages-google-cloud-discoveryengineCopy head branch name to clipboard