(WIP) Work towards #4907 on 3.x: reduce introspection for "java.*" classes (and maybe others too)

[cowtowncoder]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.41%. Comparing base (707d8c6) to head (d1ea337).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.x    #5137      +/-   ##
============================================
+ Coverage     72.40%   72.41%   +0.01%     
- Complexity    10922    10926       +4     
============================================
  Files           504      504              
  Lines         36283    36286       +3     
  Branches       6738     6738              
============================================
+ Hits          26270    26277       +7     
+ Misses         7215     7212       -3     
+ Partials       2798     2797       -1     

Flag	Coverage Δ
unittests	72.41% <100.00%> (+0.01%)	⬆️

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