Add option for including explicit interface implementations

[mikernet]

Adds includeExplicitInterfaceImplementations metadata option which allows including explicit interface implementations without exposing all private members.

[codecov]

Codecov Report

Patch coverage: 28.57% and project coverage change: -0.03 ⚠️

Comparison is base (cabaa2f) 77.28% compared to head (fe1215e) 77.26%.

❗ Current head fe1215e differs from pull request most recent head d089685. Consider uploading reports for the commit d089685 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8446      +/-   ##
==========================================
- Coverage   77.28%   77.26%   -0.03%     
==========================================
  Files         858      858              
  Lines       30649    30663      +14     
==========================================
+ Hits        23688    23691       +3     
- Misses       6961     6972      +11     

Impacted Files	Coverage Δ
src/Microsoft.DocAsCode.Dotnet/SymbolFilter.cs	82.25% <9.09%> (-15.79%)	⬇️
src/Microsoft.DocAsCode.Dotnet/DotnetApiCatalog.cs	96.29% <100.00%> (+0.06%)	⬆️
...de.Dotnet/ExtractMetadata/ExtractMetadataConfig.cs	100.00% <100.00%> (ø)
...crosoft.DocAsCode.Dotnet/MetadataJsonItemConfig.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[mikernet]

@yufeih Could you review this for suitability before I go too far into testing?

[yufeih]

The contract and draft implementation looks good for adding unit testing here