Add Setting to Control Writing Page Index in Parquet Files

Why it matters

This feature allows users to control whether the page index is written into Parquet files during export. Disabling the page index can reduce file size and potentially improve file write performance when the index is not needed.

How to use it

Use the new setting to toggle page index writing when exporting to Parquet files. For example, set the system setting parquet_write_page_index to 0 to disable or 1 to enable writing the page index.