feat: extend C box API with new user methods
Introduce new methods:
- box_user_id_by_name - get the user identifier by name;
- box_effective_user_id - get current effective user identifier;
- box_session_user_id - get current session user identifier;
- box_session_su - change current session user;
Current MR is a part of the task to provide authentication for the cluster-wide sql in picodata. Next steps: wrap current API with tarantool module and use inside sbroad rust code to check permissions.
See also:
Edited by Denis Smirnov