Handle attaching files at vector store creation

This wires up the `file_ids` from the vector store create request to
actually attach all those files at creation time. This also required
smarter handling of the file_ids and file_count metadata handling to
ensure we update the in-memory cache and persistent representation of
those as we attach those files. And, expand that logic to handle
errors during file attachment to persist the failed status.

Signed-off-by: Ben Browning <bbrownin@redhat.com>

llama_stack/providers/inline/vector_io/sqlite_vec/sqlite_vec.py

@@ -660,7 +660,6 @@ class SQLiteVecVectorIOAdapter(OpenAIVectorStoreMixin, VectorIO, VectorDBsProtoc
                     (store_id, file_id),
                 )
                 row = cur.fetchone()
-                print(f"!!! row is {row}")
                 if row is None:
                     return None
                 (metadata,) = row