Generalize ChatQnA external LLM to external inferencing support #1167
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Description
vLLM already support all ChatQnA inferencing sub-services: LLM, embedding, reranking, guardrails. In ChatQnA example value files, all except embedding are HW accelerated. Additionally, KubeAI already supports first three, and OPEA has Enterprise-Inferencing subproject: https://github.com/opea-project/Enterprise-Inference
Therefore it seems relevant to start discussion on how current external LLM support in the Helm charts could be changed to a more generic external inferencing support, before current support gets into too wide use.
To start that discussing, this PR includes draft of such changes for ChatQnA, and TODOs for items currently missing from ChatQnA code in GenAIExamples.
Issues
n/a.Type of change
Dependencies
This is dependency disconnection.
Tests
Not relevant yet.