community: add delete method to rocksetdb vectorstore to support recordmanager (#17030)

- **Description:** This adds a delete method so that rocksetdb can be
used with `RecordManager`.
  - **Issue:** N/A
  - **Dependencies:** N/A
  - **Twitter handle:** `@_morgan_adams_`

---------

Co-authored-by: Rockset API Bot <admin@rockset.io>

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

@@ -68,6 +68,7 @@ def test_compatible_vectorstore_documentation() -> None:
         "Pinecone",
         "Qdrant",
         "Redis",
+        "Rockset",
         "ScaNN",
         "SemaDB",
         "SupabaseVectorStore",