Refactor the NVTX and add the annotation for task begin and end

[eddy16112]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 29.50%. Comparing base (3fe7c85) to head (501083c).
⚠️ Report is 9 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/realm/threads.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #453      +/-   ##
==========================================
- Coverage   30.09%   29.50%   -0.60%     
==========================================
  Files         196      197       +1     
  Lines       40714    42450    +1736     
  Branches    14649    15738    +1089     
==========================================
+ Hits        12254    12524     +270     
- Misses      27685    29368    +1683     
+ Partials      775      558     -217     

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