Mark some well known cli functions as implicit unsupported api

[arturbosch]

Not sure if necessary but may help to remind us to not break these functions in further refactorings.

[codecov]

Codecov Report

Merging #2742 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2742   +/-   ##
=========================================
  Coverage     80.59%   80.59%           
  Complexity     2315     2315           
=========================================
  Files           380      380           
  Lines          6976     6976           
  Branches       1260     1260           
=========================================
  Hits           5622     5622           
  Misses          728      728           
  Partials        626      626           

Impacted Files	Coverage Δ	Complexity Δ
.../io/gitlab/arturbosch/detekt/cli/Configurations.kt	76.47% <ø> (ø)	0.00 <0.00> (ø)
...ain/kotlin/io/gitlab/arturbosch/detekt/cli/Main.kt	31.81% <ø> (ø)	5.00 <0.00> (ø)
.../io/gitlab/arturbosch/detekt/cli/runners/Runner.kt	94.00% <ø> (ø)	10.00 <0.00> (ø)

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[schalkms]

Good idea!

[BraisGabin]

I love this! It also help us to know what to hide in 2.0

[arturbosch]

Cool that it is helpful :)