Handle large IIS log values

[PrzemyslawKlys]

Summary

• expand IIS log metrics to nullable 64-bit fields
• parse large byte counts and timings using long values
• verify parsing of values exceeding 2GB

Testing

• dotnet test

---

https://chatgpt.com/codex/tasks/task_e_68a8ce6b57e8832e860c53c64aeba9ec

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.82%. Comparing base (8f21a8b) to head (b40dbd6).

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   81.81%   82.82%   +1.01%     
==========================================
  Files           3        3              
  Lines          99       99              
  Branches       16       16              
==========================================
+ Hits           81       82       +1     
  Misses         13       13              
+ Partials        5        4       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.