perf(persistence): Move thread messages pagination to SQL

[VelikovPetar]

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Linear: FLU-487

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Description of the pull request

Back-port of #2688 to v9. Refactors MessageDao.getThreadMessagesByParentId to filter and paginate thread replies at the SQL level instead of loading the full thread into memory, and adds support for all four PaginationParams cursor variants (lessThan / lessThanOrEqual / greaterThan / greaterThanOrEqual) with a (createdAt, id) tiebreaker.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v9@fa471c5). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             v9    #2750   +/-   ##
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  Coverage      ?   66.00%           
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  Files         ?      425           
  Lines         ?    26970           
  Branches      ?        0           
=====================================
  Hits          ?    17802           
  Misses        ?     9168           
  Partials      ?        0           

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