perf(parquet): prune row selection with OffsetIndex

[XiaoHongbo-Hope]

Purpose

A row selection without predicates did not load the Parquet OffsetIndex. Arrow-rs could filter rows, but still fetched unselected data pages, including pages for nested columns.

This is independent of #590: that PR prunes files, while this change prunes pages inside a retained Parquet file. It also improves selected-range reads introduced by #592.

Changes

• Load ColumnIndex for predicate page pruning.
• Load OffsetIndex for predicates or row selections.
• Add a nested List regression test that verifies sparse selection reduces page I/O.

Tests

• cargo fmt --all -- --check
• Parquet module tests: 41 passed
• paimon library tests: 1,839 passed, 1 ignored
• clippy with warnings denied

[QuakeWang]

LGTM