feat: Support for multilingual embedding models and simultaneous hosting of LLM & embedding models

[eckartal]

Problem
Jan lacks support for multilingual embedding models and cannot host both LLM and embedding models simultaneously.

Success Criteria
Jan should be enhanced to support a broader range of multilingual embedding models. Plus, it should be capable of hosting both LLM and embedding models concurrently within a single system.

Additional context
Add any other context or screenshots about the feature request here.

[kalle07]

yes if iam right
maybe that is a german type of such model

https://huggingface.co/aari1995/German_Semantic_STS_V2