Support optional Parquet page index writes

## Feature Request / Improvement

PyIceberg doesn't expose Parquet page index writing, even though PyArrow supports it with `ParquetWriter(write_page_index=True)`.

### Use case / motivation

Page indexes let readers such as ClickHouse skip non-matching pages during predicate evaluation, avoiding decoding work for selective queries. Tables written by PyIceberg currently lack these indexes, so page-level pruning is not possible regardless of reader support.

### Proposed change

Add an opt-in `write.parquet.page-index-enabled` table property, default false, to preserve current output and file sizes. When enabled, PyIceberg passes `write_page_index=True` to PyArrow's ParquetWriter.

### Implementation

PR #3829 adds the table property, threads it through `_get_parquet_writer_kwargs`, documents it in mkdocs/docs/configuration.md, and includes unit and integration test coverage.

### Tooling note

I developed this with assistance from DS v4 Pro and reviewed the changes myself.

### References

- #3829

先檢視 PR #3829，接著檢查 _get_parquet_writer_kwargs、mkdocs/docs/configuration.md，以及所參照的單元測試和整合測試。完成的標準是：opt-in 屬性預設仍為 false，在為 true 時啟用 PyArrow 頁面索引寫入，且文件中記載的測試通過。

由索引模型根據 Issue 內容生成。