Add Team Drive model and basic fetch.
Add Team Drive model, basic fetch (no File search query string) and fetch test.
Add Team Drive usage example that allows listing Team Drives and their contents (very crude). Uses teamdrivefetchjob and filefetchjob.
Test Plan: See provided example in examples/teamdrive.
Reviewed By: dvratil
Subscribers: kde-pim, LibKGAPI
Maniphest Tasks: T10521
Differential Revision: https://phabricator.kde.org/D19403