feat: add `shared_vfolders_info` and `update_shared_vfolder` APIs to client-py

[agatha197]

• Description: To show the shared vfolder info and update the permission, I added the client-py API. shared_vfolders_info shows the information such as folder name, folder id, owner, permission, folder type, shared to, etc. update_shared_vfolder updates permission for the given shared vfolders.

• Related PR: https://github.com/lablup/backend.ai-control-panel/pull/287

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[Questions]

• I'm not sure which one is better to set as a name, shared vfolders_info / update_vfolder permission and update_shared_vfolder / vfolder_permission_info.

• To prevent normal users from modifying other people's shared folders, the following options are possible. Which one is the best?

  1. Edit manager
  2. Set as admin-only API
  3. Add logic to determine whether client-py is admin or not