Add XML documentation for PowerShell cmdlet

[PrzemyslawKlys]

Summary

• document Get-IISParsedLog cmdlet with synopsis, examples, notes, and links
• document asynchronous PSCmdlet base and IISLogEvent output type
• enable strict XML documentation checks during build

Testing

• dotnet build IISParser.sln
• dotnet test IISParser.sln
• pwsh -NoLogo -NoProfile -Command 'Invoke-Pester -Path Module/Tests -CI' (fails: Get-IISParsedLog not found)

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https://chatgpt.com/codex/tasks/task_e_68a8c1f8dbe8832e85a5b77d329854fb

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.81%. Comparing base (43cee7a) to head (1f35b66).

Additional details and impacted files

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  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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