community[minor]: Add TablestoreVectorStore (#25767)

Thank you for contributing to LangChain!

- [x] **PR title**:  community: add TablestoreVectorStore



- [x] **PR message**: 
    - **Description:** add TablestoreVectorStore
    - **Dependencies:** none


- [x] **Add tests and docs**: If you're adding a new integration, please
include
  1. a test for the integration: yes
  2. an example notebook showing its use: yes

If no one reviews your PR within a few days, please @-mention one of
baskaryan, efriis, eyurtsev, ccurme, vbarda, hwchase17.

---------

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

libs/community/tests/unit_tests/vectorstores/test_imports.py

@@ -84,6 +84,7 @@ EXPECTED_ALL = [
     "StarRocks",
     "SupabaseVectorStore",
     "SurrealDBStore",
+    "TablestoreVectorStore",
     "Tair",
     "TencentVectorDB",
     "TiDBVectorStore",

libs/community/tests/unit_tests/vectorstores/test_indexing_docs.py

@@ -88,6 +88,7 @@ def test_compatible_vectorstore_documentation() -> None:
         "SingleStoreDB",
         "SupabaseVectorStore",
         "SurrealDBStore",
+        "TablestoreVectorStore",
         "TileDB",
         "TimescaleVector",
         "TencentVectorDB",