Add Shared Drives to GDriveUrl slave.

Summary:
Adds listing of account Shared Drives through the url 'gdrive:/account@gmail.com/Shared Drives/'.

Supported operations:

• Create via 'Create New' -> 'Folder...'
• Delete (if empty)
• Rename

Discussion in T10630: Show Team Drives

Reviewers: elvisangelaccio

Reviewed By: elvisangelaccio

Subscribers: KIO GDrive

Tags: KIO GDrive

Differential Revision: https://phabricator.kde.org/D23804