Normalize expanded field names

[PrzemyslawKlys]

Summary

• sanitize expanded field keys into PowerShell-friendly identifiers
• document field name transformation and provide usage example
• test expanded property names via Pester

Testing

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

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https://chatgpt.com/codex/tasks/task_e_68a97a322948832e92ec7c4da655ac08

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.80%. Comparing base (3e113bf) to head (5a84c70).
⚠️ Report is 19 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   82.80%   82.80%           
=======================================
  Files           4        4           
  Lines         157      157           
  Branches       32       32           
=======================================
  Hits          130      130           
  Misses         20       20           
  Partials        7        7           

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