Add embedding model support

[Undertone0809]

🚀 Feature Request

Add embedding model support like litellm. Eg usage:

import pne

pne.embedding(
    model="embed-english-v3.0", 
    input=["good morning from litellm", "this is another item"], 
    input_type="search_document" # optional param for v3 llms
)

references: https://docs.litellm.ai/docs/embedding/supported_embedding