Add C# IIS log parser and PowerShell cmdlet

[PrzemyslawKlys]

Summary

• move existing module files into Module
• add cross-targeted IISParser library with log parser
• introduce PowerShell cmdlet implementation
• cover parser with unit and Pester tests
• support custom IIS log fields and expose them in cmdlet output

Testing

• dotnet build
• dotnet test
• pwsh -NoLogo -NoProfile -Command "Set-PSRepository PSGallery -InstallationPolicy Trusted; Install-Module Pester -Scope CurrentUser -Force; Invoke-Pester -Path Module/Tests -CI" (no output, possibly missing Pester)

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https://chatgpt.com/codex/tasks/task_e_68a77cea34e0832ea2bd4d48a5769ba0