community[minor]: VectorStore integration for SAP HANA Cloud Vector E…

…ngine (#16514)

- **Description:**
This PR adds a VectorStore integration for SAP HANA Cloud Vector Engine,
which is an upcoming feature in the SAP HANA Cloud database
(https://blogs.sap.com/2023/11/02/sap-hana-clouds-vector-engine-announcement/).

  - **Issue:** N/A
- **Dependencies:** [SAP HANA Python
Client](https://pypi.org/project/hdbcli/)
  - **Twitter handle:** @sapopensource

Implementation of the integration:
`libs/community/langchain_community/vectorstores/hanavector.py`

Unit tests:
`libs/community/tests/unit_tests/vectorstores/test_hanavector.py`

Integration tests:
`libs/community/tests/integration_tests/vectorstores/test_hanavector.py`

Example notebook:
`docs/docs/integrations/vectorstores/hanavector.ipynb`

Access credentials for execution of the integration tests can be
provided to the maintainers.

---------

Co-authored-by: sascha <sascha.stoll@sap.com>
Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/docs/modules/data_connection/indexing.ipynb

@@ -60,7 +60,7 @@
     "   * document addition by id (`add_documents` method with `ids` argument)\n",
     "   * delete by id (`delete` method with `ids` argument)\n",
     "\n",
-    "Compatible Vectorstores: `AnalyticDB`, `AstraDB`, `AwaDB`, `Bagel`, `Cassandra`, `Chroma`, `DashVector`, `DatabricksVectorSearch`, `DeepLake`, `Dingo`, `ElasticVectorSearch`, `ElasticsearchStore`, `FAISS`, `MyScale`, `PGVector`, `Pinecone`, `Qdrant`, `Redis`, `ScaNN`, `SupabaseVectorStore`, `SurrealDBStore`, `TimescaleVector`, `Vald`, `Vearch`, `VespaStore`, `Weaviate`, `ZepVectorStore`.\n",
+    "Compatible Vectorstores: `AnalyticDB`, `AstraDB`, `AwaDB`, `Bagel`, `Cassandra`, `Chroma`, `DashVector`, `DatabricksVectorSearch`, `DeepLake`, `Dingo`, `ElasticVectorSearch`, `ElasticsearchStore`, `FAISS`, `HanaDB`, `MyScale`, `PGVector`, `Pinecone`, `Qdrant`, `Redis`, `ScaNN`, `SupabaseVectorStore`, `SurrealDBStore`, `TimescaleVector`, `Vald`, `Vearch`, `VespaStore`, `Weaviate`, `ZepVectorStore`.\n",
     "  \n",
     "## Caution\n",
     "\n",

libs/community/langchain_community/vectorstores/__init__.py

@@ -204,6 +204,12 @@ def _import_faiss() -> Any:
     return FAISS
 
 
+def _import_hanavector() -> Any:
+    from langchain_community.vectorstores.hanavector import HanaDB
+
+    return HanaDB
+
+
 def _import_hologres() -> Any:
     from langchain_community.vectorstores.hologres import Hologres
 
@@ -527,6 +533,8 @@ def __getattr__(name: str) -> Any:
         return _import_epsilla()
     elif name == "FAISS":
         return _import_faiss()
+    elif name == "HanaDB":
+        return _import_hanavector()
     elif name == "Hologres":
         return _import_hologres()
     elif name == "KDBAI":
@@ -645,6 +653,7 @@ def __getattr__(name: str) -> Any:
     "ElasticsearchStore",
     "Epsilla",
     "FAISS",
+    "HanaDB",
     "Hologres",
     "KDBAI",
     "LanceDB",