Change task_id to string

[yuwmao]

This pr is the adaption change for eBay/HomeStore#758

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 62.65%. Comparing base (1746bcc) to head (ffb5437).
Report is 97 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib/homestore_backend/hs_pg_manager.cpp	80.00%	1 Missing ⚠️
src/lib/memory_backend/mem_pg_manager.cpp	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #316      +/-   ##
==========================================
- Coverage   63.15%   62.65%   -0.51%     
==========================================
  Files          32       35       +3     
  Lines        1900     3976    +2076     
  Branches      204      480     +276     
==========================================
+ Hits         1200     2491    +1291     
- Misses        600     1226     +626     
- Partials      100      259     +159     

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[Besroy]

LGTM