feat: FastEmbed embedding provider (#13109)
## Description:
This PR intends to add
[Qdrant/FastEmbed](https://qdrant.github.io/fastembed/) as a local
embeddings provider, associated tests and documentation.
**Documentation preview:**
https://langchain-git-fork-anush008-master-langchain.vercel.app/docs/integrations/text_embedding/fastembed
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Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
