Add support of Nomic embeddings API

[bntv-config]

trafficstars

Nomic is very fast and open soruce embedding API. Please add support on spring AI.

curl https://api-atlas.nomic.ai/v1/embedding/text
-H "Authorization: Bearer $NOMIC_API_KEY"
-H "Content-Type: application/json"
-d '{ "model": "nomic-embed-text-v1", "texts": ["The quick brown fox..."]}'

URL can be local or other deployment, I have given example for cloud