Watch a file or directory in the source
Dependency
gitlab-ce#24892 per https://gitlab.com/gitlab-org/gitlab-ee/issues/1817#note_25053118
Description
It is often the case in a big team that you work on some part of project and you want to be notified on changing some file or directory in there. It can be just a button on top of files tree. One more table (project_id, watch_path, user_id), one more notification type.
What do you think about this idea @dzaporozhets @JobV ?
PS. Although it can be easily implemented with WebHook in a separate application if someone needs it but having it built-in is a more powerful solution.