Add option to pass storage config to polars lazy read

### Feature Request / Improvement

I was not able to use the `table.to_polars()` method because there is no option to include a storage_options param which is mentioned in the [polars docs](https://docs.pola.rs/api/python/dev/reference/api/polars.scan_iceberg.html).

從 table.to_polars() 的實作開始，追蹤它如何呼叫 Polars 的延遲讀取路徑。查看 issue 中連結的 Polars scan_iceberg 文件，了解 storage_options 介面。完成的標準是：呼叫端可以透過 table.to_polars() 提供 storage_options，該選項能傳遞到延遲讀取操作，且相關測試已更新或新增。

由索引模型根據 Issue 內容生成。