feat(transformers): add embeddings with Automodel (#1308)

* Update huggingface.py

Switch SentenceTransformer for AutoModel in order to set trust_remote_code needed to use the encode method with embeddings models like jinai-v2

Signed-off-by: Lucas Hänke de Cansino <lhc@next-boss.eu>

* feat(transformers): split in separate backend

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

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Signed-off-by: Lucas Hänke de Cansino <lhc@next-boss.eu>
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Lucas Hänke de Cansino <lhc@next-boss.eu>