split rule documentation printer to improve testability

[marschwar]

This improves the testability of the rule config printer in preparation of configuration items with value and reason (#3501).

[codecov]

Codecov Report

Merging #4578 (45e0ce6) into main (7d87c80) will increase coverage by 0.00%.
The diff coverage is 93.87%.

❗ Current head 45e0ce6 differs from pull request most recent head 143a59b. Consider uploading reports for the commit 143a59b to get more accurate results

@@            Coverage Diff            @@
##               main    #4578   +/-   ##
=========================================
  Coverage     84.45%   84.46%           
- Complexity     3330     3332    +2     
=========================================
  Files           479      481    +2     
  Lines         11143    11147    +4     
  Branches       2040     2040           
=========================================
+ Hits           9411     9415    +4     
  Misses          699      699           
  Partials       1033     1033           

Impacted Files	Coverage Δ
...arturbosch/detekt/generator/printer/RulePrinter.kt	88.88% <88.88%> (ø)
...gitlab/arturbosch/detekt/generator/out/Markdown.kt	27.27% <100.00%> (+2.27%)	⬆️
...tekt/generator/printer/RuleConfigurationPrinter.kt	100.00% <100.00%> (ø)
...sch/detekt/generator/printer/RuleSetPagePrinter.kt	75.00% <100.00%> (-15.39%)	⬇️

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