Changes to Search memories by natural language query

added the optional property results/items/createdAt to the response with the 200 status

added the optional property results/items/summary to the response with the 200 status

added the new optional request property keyPrefix

added the required property results/items/accessCount to the response with the 200 status

added the media type application/json for the response with the status 200

added the media type application/json for the response with the status 400

added the new optional request property intent

added the new optional request property scope

added the new optional request property source