feat: using pack from llamaindex (#10962)

...ma-index-packs-agent-search-retriever/examples/example.py

...ndex-packs-arize-phoenix-query-engine/examples/example.py

...ma-index-packs-auto-merging-retriever/examples/example.py

...s/llama-index-packs-cogniswitch-agent/examples/example.py

...acks/llama-index-packs-corrective-rag/examples/example.py

...s/llama-index-packs-dense-x-retrieval/examples/example.py

...packs/llama-index-packs-rag-evaluator/examples/example.py

...index-packs-rag-fusion-query-pipeline/examples/example.py

...llama-index-packs-voyage-query-engine/examples/example.py