Refactor parser to stream IIS log events lazily

[PrzemyslawKlys]

Summary

• stream parsed events from log files instead of buffering in memory
• lazily consume ParseLog results in Get-IISParsedLog
• add test coverage and example for streaming behavior

Testing

• dotnet test
• pwsh -NoLogo -NoProfile -Command "Import-Module ./Module/IISParser.psd1; Invoke-Pester Module/Tests/Get-IISParsedLog.Tests.ps1"

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https://chatgpt.com/codex/tasks/task_e_68a95c5c9c68832e8414d7fded0f171a

[codecov-commenter]

Codecov Report

❌ Patch coverage is 46.15385% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.82%. Comparing base (6ac3ed8) to head (740304e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
IISParser/ParserEngine.cs	46.15%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
- Coverage   86.50%   85.82%   -0.69%     
==========================================
  Files           3        3              
  Lines         126      127       +1     
  Branches       18       20       +2     
==========================================
  Hits          109      109              
- Misses         13       14       +1     
  Partials        4        4              

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