Add ability to copy sharing link for folder in google drive

[cyberduck]

e15fe2c created the issue

Currently (Cyberduck 7.0.2 and Mountain Duck 3.1.1 on MacOS 10.14) I can only copy sharing links for individual files on google drive, not folders. The ability to easily share folders on google drive with colleagues through email is very important to me and the lack of an easy way to do this is a major impediment to my using Mountain Duck as a replacement for Google Drive File Stream. I would really appreciate the ability to retrieve the sharing link for a google drive folder.

[cyberduck]

@dkocher commented

In 5a5528b.