add raptor (#11527)

.github/workflows/publish_sub_package.yml

llama-index-packs/llama-index-packs-raptor/.gitignore

llama-index-packs/llama-index-packs-raptor/BUILD

llama-index-packs/llama-index-packs-raptor/Makefile

llama-index-packs/llama-index-packs-raptor/README.md

...ndex-packs/llama-index-packs-raptor/examples/raptor.ipynb

...ptor/81db1dbe-a06d-43a6-ba07-875398bc33a7/data_level0.bin

...es/raptor/81db1dbe-a06d-43a6-ba07-875398bc33a7/header.bin

...es/raptor/81db1dbe-a06d-43a6-ba07-875398bc33a7/length.bin

...aptor/81db1dbe-a06d-43a6-ba07-875398bc33a7/link_lists.bin

...s/llama-index-packs-raptor/examples/raptor/chroma.sqlite3

...s/llama-index-packs-raptor/llama_index/packs/raptor/BUILD

...a-index-packs-raptor/llama_index/packs/raptor/__init__.py

...llama-index-packs-raptor/llama_index/packs/raptor/base.py

...index-packs-raptor/llama_index/packs/raptor/clustering.py

llama-index-packs/llama-index-packs-raptor/pyproject.toml

llama-index-packs/llama-index-packs-raptor/tests/BUILD

llama-index-packs/llama-index-packs-raptor/tests/__init__.py

...packs/llama-index-packs-raptor/tests/test_packs_raptor.py