Update supabase match_docs ddl and notebook to use expected id type (#7257)

- Description: Switch supabase match function DDL to use expected uuid
type instead of bigint
- Issue: https://github.com/hwchase17/langchain/issues/6743,
https://github.com/hwchase17/langchain/issues/7179
  - Tag maintainer:  @rlancemartin, @eyurtsev
  - Twitter handle: https://twitter.com/ShantanuNair

docs/extras/modules/data_connection/vectorstores/integrations/supabase.ipynb

@@ -43,7 +43,7 @@
     "\n",
     "       CREATE FUNCTION match_documents(query_embedding vector(1536), match_count int)\n",
     "           RETURNS TABLE(\n",
-    "               id bigint,\n",
+    "               id uuid,\n",
     "               content text,\n",
     "               metadata jsonb,\n",
     "               -- we return matched vectors to enable maximal marginal relevance searches\n",