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125ae6d9 - add Hybrid retriever that not require any external service (#8108)

add Hybrid retriever that not require any external service (#8108) - Until now, hybrid search was limited to modules requiring external services, such as Weaviate/Pinecone Hybrid Search. However, I have developed a hybrid retriever that can merge a list of retrievers using the [Reciprocal Rank Fusion](https://plg.uwaterloo.ca/~gvcormac/cormacksigir09-rrf.pdf) algorithm. This new approach, similar to Weaviate hybrid search, does not require the initialization of any external service. - Dependencies: No - Twitter handle: dayuanjian21687 --------- Co-authored-by: Bagatur <baskaryan@gmail.com>