Enable parquet page level skipping (page index pruning) by default

[alamb]

In #3834 and #847 @Ted-Jiang added support for skipping rows in the parquet scan via the RowIndex mechanism 🎉

This feature is currently enabled via a feature flag, which is disabled by default.

This ticket tracks enabling this feature by default.

Currently known items are:

• Add benchmarks for parquet queries with filter pushdown enabled #3457
• Add metrics for parquet page level skipping #4086
• Review of test coverage and add additional coverage as needed: Enable tests for page index filtering in parquet filter pushdown test #4062
• Enable this feature by default

Related to #3463

[alamb]

BTW update here is the latest benchmark runs I did -- #5099 (comment) -- show some small performance regressions we need to fix in order to turn this on by default