Refactor BuildFailure code

[schalkms]

• Refactor BuildFailure items into corresponding kt file
• Add tests for IssueExtension

[codecov-io]

Codecov Report

Merging #2250 into master will increase coverage by 0.04%.
The diff coverage is 93.54%.

@@             Coverage Diff              @@
##             master    #2250      +/-   ##
============================================
+ Coverage      81.4%   81.44%   +0.04%     
- Complexity     2077     2081       +4     
============================================
  Files           343      346       +3     
  Lines          5985     5993       +8     
  Branches       1086     1086              
============================================
+ Hits           4872     4881       +9     
  Misses          532      532              
+ Partials        581      580       -1

Impacted Files	Coverage Δ	Complexity Δ
...in/io/gitlab/arturbosch/detekt/cli/BuildFailure.kt	100% <ø> (+9.37%)	1 <0> (ø)	⬇️
.../io/gitlab/arturbosch/detekt/cli/IssueExtension.kt	93.54% <93.54%> (ø)	0 <0> (?)
...rmatting/wrappers/NoEmptyFirstLineInMethodBlock.kt	100% <0%> (ø)	2% <0%> (?)
...ch/detekt/formatting/wrappers/EnumEntryNameCase.kt	100% <0%> (ø)	2% <0%> (?)
...ab/arturbosch/detekt/formatting/KtLintMultiRule.kt	87.75% <0%> (+0.52%)	6% <0%> (ø)	⬇️

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