community[minor]: Self query retriever for HANA Cloud Vector Engine (#24494)

Description:

- This PR adds a self query retriever implementation for SAP HANA Cloud
Vector Engine. The retriever supports all operators except for contains.
- Issue: N/A
- Dependencies: no new dependencies added

**Add tests and docs:**
Added integration tests to:
libs/community/tests/unit_tests/query_constructors/test_hanavector.py

**Documentation for self query retriever:**
/docs/integrations/retrievers/self_query/hanavector_self_query.ipynb

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>

libs/langchain/langchain/retrievers/self_query/base.py

@@ -177,6 +177,16 @@ def _get_builtin_translator(vectorstore: VectorStore) -> Visitor:
             if isinstance(vectorstore, PGVector):
                 return NewPGVectorTranslator()
 
+        try:
+            # Added in langchain-community==0.2.11
+            from langchain_community.query_constructors.hanavector import HanaTranslator
+            from langchain_community.vectorstores import HanaDB
+        except ImportError:
+            pass
+        else:
+            if isinstance(vectorstore, HanaDB):
+                return HanaTranslator()
+
         raise ValueError(
             f"Self query retriever with Vector Store type {vectorstore.__class__}"
             f" not supported."