new models

Adds a few embedding models:
https://huggingface.co/Snowflake/snowflake-arctic-embed-s
https://huggingface.co/Snowflake/snowflake-arctic-embed-m-long
https://huggingface.co/BAAI/bge-m3

Also a new chat model for labeling:
https://huggingface.co/meta-llama/Meta-Llama-3-8B-Instruct

Tweaked the labeling prompt to perform better