Add Drive resource and example.
Summary:
Add support for the Drive resource as described in the Google Drive API Reference [1].
[1] https://developers.google.com/drive/api/v2/reference/drives
Test Plan: Test units have been added for the Drive resource operations. An example is included which demonstrates fetching, modifying, hiding Drives.
Reviewers: dvratil
Reviewed By: dvratil
Subscribers: LibKGAPI, dvratil, kde-pim
Differential Revision: https://phabricator.kde.org/D21838