Astra DB Vector store, package rename for naming consistency (#11056)

docs/community/integrations/vector_stores.md

docs/examples/vector_stores/AstraDBIndexDemo.ipynb

llama-index-cli/llama_index/cli/upgrade/mappings.json

llama-index-core/llama_index/core/command_line/mappings.json

...ctor_stores/llama-index-vector-stores-astra-db/.gitignore

...ns/vector_stores/llama-index-vector-stores-astra-db/BUILD

...vector_stores/llama-index-vector-stores-astra-db/Makefile

...ector_stores/llama-index-vector-stores-astra-db/README.md

...-stores-astra-db/llama_index/vector_stores/astra_db/BUILD

...s-astra-db/llama_index/vector_stores/astra_db/__init__.py

...tores-astra-db/llama_index/vector_stores/astra_db/base.py

...tor_stores/llama-index-vector-stores-astra-db/poetry.lock

..._stores/llama-index-vector-stores-astra-db/pyproject.toml

...tor_stores/llama-index-vector-stores-astra-db/tests/BUILD

...ores/llama-index-vector-stores-astra-db/tests/__init__.py

...llama-index-vector-stores-astra-db/tests/test_astra_db.py

...ctor-stores-astra-db/tests/test_vector_stores_astra_db.py

...s/vector_stores/llama-index-vector-stores-astra/README.md