to 3.0: refactor(objectio): keep zonemap for hidden rowid and ts columns

[gouhongshen]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue ##23820

What this PR does / why we need it:

1. Keep zonemap generation for hidden rowid and commit_ts columns in non-tombstone schema data on 3.0-dev.
2. Skip NDV/HLL and null-count aggregation for those hidden columns to avoid unnecessary metadata overhead.
3. Initialize object-level zonemap aggregation even when InspectVector is skipped.
4. Add focused tests covering builder-level zonemap updates and write-read verification, and keep the 8192-row microbenchmark for hidden-column overhead analysis.

Tests

1. go test ./pkg/objectio/ioutil -run 'TestObjectColumnMetasBuilderUpdateZmWithoutInspect|TestHiddenColumnsZoneMapPersistedAfterWriteAndRead' -count=1
2. go test ./pkg/objectio/ioutil -run TestNonExistent -bench BenchmarkHiddenColumnOverhead -benchmem -count=1

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-03-18 07:40 UTC · Rule: release-3.0
• ✅ Checks passed · in-place
• ✅ Merged — 2026-03-18 08:31 UTC · at 0b130d21b535756eae28ae0d55b2bd6ec85a08de

This pull request spent 51 minutes 9 seconds in the queue, including 50 minutes 56 seconds running CI.

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