wip: postgres vecto.rs db, s/haystack/langchain #41
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…i.py included; logger in api.py functional
…ed them in llm_config.py
…moved rag_piipeline from api.py; introduced rag_pipeline from rag.py into api.py
To prevent huge redownloads on llm change.
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This PR adds postgres vecto.rs as vector storage and retrieval system as well as decouples the data fetching, embedding and inserting from the startup of the system. Thanks to @Silvan-WMDE for the fetcher implementation from #42
As haystack did not integrate with vecto.rs, and I also wanted to experiment with langchain to compare it to haystack, the retrieval is now implemented by langchain, leaving us with a funny mix of libraries. To be cleaned up.
Closes #39