[FEATURE] Fireworks Embeddings Support

[faisalusuf]

Describe the feature you'd like
The Fireworks is available as ChatLLM but not for embeddings.
Additional context
The Firework embeddings are supported natively by Langchain.
https://python.langchain.com/api_reference/fireworks/embeddings/langchain_fireworks.embeddings.FireworksEmbeddings.html#langchain_fireworks.embeddings.FireworksEmbeddings

Please add the support for Fireworks embeddings for the cases where a user don't have OpenAI or other leading models access.

Regards,