feat: add allowCompilationErrors option

[yufeih]

Add an allowCompilationErrors option to report compilation errors as warnings. Enabling this option may address some edge use cases, but could also result in crashes or undefined behaviors.

fixes #8429

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@4973f9a). Click here to learn what that means.
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8554   +/-   ##
=======================================
  Coverage        ?   75.29%           
=======================================
  Files           ?      650           
  Lines           ?    23972           
  Branches        ?        0           
=======================================
  Hits            ?    18050           
  Misses          ?     5922           
  Partials        ?        0           

Impacted Files	Coverage Δ
...de.Dotnet/ExtractMetadata/ExtractMetadataWorker.cs	75.47% <75.00%> (ø)
...rc/Microsoft.DocAsCode.Dotnet/CompilationHelper.cs	87.91% <100.00%> (ø)
src/Microsoft.DocAsCode.Dotnet/DotnetApiCatalog.cs	72.88% <100.00%> (ø)
...de.Dotnet/ExtractMetadata/ExtractMetadataConfig.cs	100.00% <100.00%> (ø)
...crosoft.DocAsCode.Dotnet/MetadataJsonItemConfig.cs	100.00% <100.00%> (ø)

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