Fetches the share link for a single media. If the media does not have a
share link yet, one is created on first request with a default
visibility derived from the parent folder.

Requires api token with one of the following permissions

Read all folder and media data

Tokens with the "Act with a team member's permissions" permission
(all:delegate_to_contact_permissions scope) can also be used. Requests
made with such a token are authorized using the permissions of the
contact assigned to the token.

An expiring access token
created with the all:delegate_to_contact_permissions scope and an
authorization granting the share permission on this media can also be used.