Completely-empty abstract classes will now be flagged by UnnecessaryAbstractClass

[severn-everett]

This resolves issue #4357

[codecov]

Codecov Report

Merging #4370 (b9d6716) into main (92433ea) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #4370   +/-   ##
=========================================
  Coverage     84.26%   84.27%           
+ Complexity     3263     3261    -2     
=========================================
  Files           473      473           
  Lines         10336    10336           
  Branches       1827     1827           
=========================================
+ Hits           8710     8711    +1     
  Misses          667      667           
+ Partials        959      958    -1     

Impacted Files	Coverage Δ
...sch/detekt/rules/style/UnnecessaryAbstractClass.kt	86.95% <100.00%> (+2.17%)	⬆️

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