Fix: detect nested unsupported collection types

[Jim8y]

Summary

• recursively inspect arrays, pointers, function pointers, containing types, and generic arguments
• report the first unsupported collection type found inside a supported wrapper
• preserve support for framework and user-defined collection replacements

Why

CollectionTypesUsageAnalyzer only checked the outer named type. Types such as Tuple<int, List<string>> and Stack<int>[] could bypass NC4013.

Validation

• collection analyzer tests: 8 passed
• complete analyzer unit test suite: 285 passed
• targeted dotnet format --verify-no-changes

Part of #1841.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master-n3@c99492a). Learn more about missing BASE report.

Additional details and impacted files

@@             Coverage Diff              @@
##             master-n3    #1907   +/-   ##
============================================
  Coverage             ?   84.23%           
============================================
  Files                ?      308           
  Lines                ?    28229           
  Branches             ?     3980           
============================================
  Hits                 ?    23778           
  Misses               ?     3459           
  Partials             ?      992           

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