Introduce new ConfigValidator extensions - #2285

[arturbosch]

• Do not fail by default for custom rule set configuration properties
• Allow users to validate their config properties

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@b017b77). Click here to learn what that means.
The diff coverage is 85%.

@@            Coverage Diff            @@
##             master    #2356   +/-   ##
=========================================
  Coverage          ?   82.55%           
  Complexity        ?     2139           
=========================================
  Files             ?      351           
  Lines             ?     6065           
  Branches          ?     1111           
=========================================
  Hits              ?     5007           
  Misses            ?      479           
  Partials          ?      579

Impacted Files	Coverage Δ	Complexity Δ
...tlab/arturbosch/detekt/cli/config/InvalidConfig.kt	100% <ø> (ø)	1 <0> (?)
...ain/kotlin/io/gitlab/arturbosch/detekt/cli/Main.kt	36% <ø> (ø)	6 <0> (?)
.../io/gitlab/arturbosch/detekt/cli/runners/Runner.kt	92.3% <ø> (ø)	12 <0> (?)
...ekt/cli/config/DefaultPropertiesConfigValidator.kt	100% <100%> (ø)	1 <1> (?)
...b/arturbosch/detekt/cli/config/ConfigValidators.kt	72.72% <72.72%> (ø)	0 <0> (?)

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