GitLab

* fix config save

* add test

* add config class variable and another test

* line break

* fix fsmt and typo

* god am I making many errors today :-/

* Update src/transformers/configuration_utils.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>