Add file/folder facet to graph search containing driveitems.

Driveitem results found using the https://docs.microsoft.com/en-us/graph/api/resources/search-api-overview?view=graph-rest-1.0 does not return a file or folder facet.

These facets are normal when working with driveitems collected from the https://docs.microsoft.com/en-us/graph/api/resources/onedrive?view=graph-rest-1.0

I see no easy way of seperating files from folders without further (batch) queries for all the results.