Add trace logging for component schema generation

[bkoelman]

Turned off by default, but is turned on in OpenApiTests.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

Fixes #1626.

[codecov]

Codecov Report

Attention: Patch coverage is 94.67456% with 9 lines in your changes missing coverage. Please review.

Project coverage is 90.79%. Comparing base (b5f0a9e) to head (632bb7b).
Report is 1 commits behind head on openapi.

Files with missing lines	Patch %	Lines
...Core.OpenApi.Swashbuckle/SchemaGenerationTracer.cs	82.69%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           openapi    #1709      +/-   ##
===========================================
+ Coverage    90.75%   90.79%   +0.04%     
===========================================
  Files          466      467       +1     
  Lines        14451    14596     +145     
  Branches      2293     2296       +3     
===========================================
+ Hits         13115    13253     +138     
- Misses         909      915       +6     
- Partials       427      428       +1     

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