Store model details

We need to store model_details just like we store the worker_details . This way, we know the ID of the loaded model.

https://gitlab.teklia.com/workers/base-worker/-/blob/f8a360f07f4b4d7e8c980e58df401e33752a485f/arkindex_worker/worker/base.py

Please update https://workers.arkindex.org/contents/implem/configure/#important-class-attributes