GitLab

* add custom `stopping_criteria` and `logits_processor` to `generate`

* add tests for custom `stopping_criteria` and `logits_processor`

* fix typo in RAG

* address reviewer comments

* improve custom logits processor/stopping criteria error message

* fix types in merge function signature

* change default for custom list from `None` to empty list

* fix rag generate

* add string split suggestion
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>