Missing retry in storage and firestore trigger decorators

Hi there,

There doesn't seem to be a way to enable retry on Firebase Storage `storage_fn` and Firestore `firestore_fn` background functions. It would really be helpful if we can enable it similar to the `pubsub_fn.on_message_published(retry=)`.

先閱讀 pubsub_fn.on_message_published(retry=)，並將其與 storage_fn 和 firestore_fn 裝飾器進行比較。追蹤相關裝飾器的進入點與測試，然後確認兩個裝飾器都接受 retry 設定，且產生的函式會如預期重試。

由索引模型根據 Issue 內容生成。