Feature/databricks vector search (#10754)

docs/examples/vector_stores/DatabricksVectorSearchDemo.ipynb

docs/module_guides/storing/vector_stores.md

...or_stores/llama-index-vector-stores-databricks/.gitignore

.../vector_stores/llama-index-vector-stores-databricks/BUILD

...ctor_stores/llama-index-vector-stores-databricks/Makefile

...tor_stores/llama-index-vector-stores-databricks/README.md

...res-databricks/llama_index/vector_stores/databricks/BUILD

...tabricks/llama_index/vector_stores/databricks/__init__.py

...s-databricks/llama_index/vector_stores/databricks/base.py

...tores/llama-index-vector-stores-databricks/pyproject.toml

...r_stores/llama-index-vector-stores-databricks/tests/BUILD

...es/llama-index-vector-stores-databricks/tests/__init__.py

...icks/tests/test_vector_stores_databricks_vector_search.py