python: Can't list nearby notifications

[bradmurray]

When I call a --list-attachments it does not show nearby notifications which are attachments created by calling --create-attachment and setting --namespaced-type to com.google.nearby/en

The added problem is that there is no way to delete these attachments because they don't have a name. I do get the attachment name back when I call --create-attachment so if I save it from that call I can perform the delete, but there seems to be no way to query the attachments if they are nearby notifications.