distage-roles: move *Impls to companion object

[neko-kai]

No description provided.

[codecov-io]

Codecov Report

Merging #701 into develop will increase coverage by 0.02%.
The diff coverage is 87.93%.

@@             Coverage Diff             @@
##           develop     #701      +/-   ##
===========================================
+ Coverage    75.35%   75.37%   +0.02%     
===========================================
  Files          533      532       -1     
  Lines        13039    13044       +5     
  Branches       631      630       -1     
===========================================
+ Hits          9825     9832       +7     
+ Misses        3214     3212       -2

Impacted Files	Coverage Δ
...e/roles/services/PlanCircularDependencyCheck.scala	60% <ø> (ø)	⬆️
...istage/roles/logger/SimpleLoggerConfigurator.scala	80% <ø> (ø)	⬆️
...main/scala/izumi/distage/roles/internal/Help.scala	0% <ø> (ø)	⬆️
...la/izumi/distage/roles/internal/ConfigWriter.scala	85.91% <ø> (ø)	⬆️
...r/plugins/macrodefs/StaticPluginCheckerMacro.scala	71.42% <100%> (ø)	⬆️
...services/st/adapter/DistagePluginTestSupport.scala	96.87% <100%> (ø)	⬆️
...la/izumi/distage/roles/services/PluginSource.scala	100% <100%> (ø)
...stkit/services/st/adapter/DistageTestSupport.scala	97.22% <100%> (ø)	⬆️
...t/services/dstest/DistageTestEnvironmentImpl.scala	100% <100%> (ø)	⬆️
...in/scala/izumi/distage/roles/RoleAppLauncher.scala	95.12% <100%> (+0.06%)	⬆️
... and 20 more

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