curl --request GET \
  --url https://api.contextual.ai/v1/extract/schemas \
  --header 'Authorization: Bearer <token>'

{
  "schemas": [
    {
      "schema_id": "<string>",
      "name": "<string>",
      "schema_definition": {},
      "metadata": {},
      "created_at": "<string>",
      "updated_at": "<string>",
      "description": "<string>"
    }
  ],
  "total_count": 123,
  "next_cursor": "<string>",
  "prev_cursor": "<string>"
}