Support expanding fields only on demand

[PrzemyslawKlys]

Summary

• Add -Expand switch to Get-IISParsedLog to optionally flatten log fields
• Cover default and expanded output with new Pester tests
• Document -Expand usage in example script

Testing

• dotnet test
• pwsh -NoLogo -File Module/IISParser.Tests.ps1
• dotnet format IISParser.sln --no-restore --include IISParser.PowerShell/CmdletGetIISParsedLog.cs (fails: Required references did not load)

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https://chatgpt.com/codex/tasks/task_e_68a8cad826d0832eb4a443264c01f924

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.81%. Comparing base (5f88d66) to head (317d1c2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   81.81%   81.81%           
=======================================
  Files           3        3           
  Lines          99       99           
  Branches       16       16           
=======================================
  Hits           81       81           
  Misses         13       13           
  Partials        5        5           

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