[PR] Add native maintenance timing and visibility-map statistics [cloudberry]

["Alena0704 (via GitHub)" <gi...@apache.org>]

Alena0704 opened a new pull request, #2104:
URL: https://github.com/apache/cloudberry/pull/2104

   ### What does this PR do?
   
   Expose maintenance duration and visibility-map stability through native
   cumulative statistics and catalog views.
   
   - Track VACUUM and ANALYZE elapsed time, index vacuum time, and database
     vacuum totals.
   - Measure cost-based delays when track_cost_delay_timing is enabled and
     expose delay time in progress reporting.
   - Count completed vacuums that entered failsafe mode and vacuums interrupted
     by errors.
   - Track cleared all-visible and all-frozen VM bits.
   - Add pg_class.relallfrozen and maintain it through vacuum, analyze and
     relation lifecycle operations.
   - Measure active AO vacuum phases, excluding gaps between phases.
   
   Expose the statistics through SQL getters and local, per-instance and cluster
   summary views. Catalog exposure and tests are kept in a separate commit.
   
   ### Test Plan
   
   - Added SQL and isolation coverage for VM and AO behavior.
   
   ### Impact
   
   Changes the pg_class layout and bumps the catalog version; development
   clusters require initdb. Updates the cumulative-statistics file format.
   
   ### Type of Change
   - [ ] Bug fix (non-breaking change)
   - [x] New feature (non-breaking change)
   - [ ] Breaking change (fix or feature with breaking changes)
   - [x] Documentation update
   
   ### Breaking Changes
   <!-- Remove if not applicable. If yes, explain impact and migration path -->
   
   ### Test Plan
   <!-- How did you test these changes? -->
   - [ ] Unit tests added/updated
   - [x] Integration tests added/updated
   - [ ] Passed `make installcheck`
   - [ ] Passed `make -C src/test installcheck-cbdb-parallel`
   
   ### Checklist
   - [x] Followed [contribution guide](https://cloudberry.apache.org/contribute/code)
   - [x] Added/updated documentation
   - [ ] Reviewed code for security implications
   - [ ] This PR contains AI-assisted code generation
   - [ ] Requested review from [cloudberry committers](https://github.com/orgs/apache/teams/cloudberry-committers)


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