fix(taps): Unmapped sub-fields in object-type fields are now no longer dropped when the field declares additionalProperties

[edgarrmondragon]

Closes #2300

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📚 Documentation preview 📚: https://meltano-sdk--2301.org.readthedocs.build/en/2301/

[codspeed-hq]

CodSpeed Performance Report

Merging #2301 will not alter performance

_{Comparing 2300-bug-object-properties-are-dropped-even-when-additionalproperties-is-used (12b8282) with main (a65c561)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.76%. Comparing base (a65c561) to head (12b8282).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2301      +/-   ##
==========================================
+ Coverage   88.74%   88.76%   +0.01%     
==========================================
  Files          54       54              
  Lines        4772     4779       +7     
  Branches      929      930       +1     
==========================================
+ Hits         4235     4242       +7     
  Misses        374      374              
  Partials      163      163              

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