Move internal config api to core module

[arturbosch]

The Config implementation was deprecated in march 2020, typealiases removed in 1.13 and now we can move that stuff into core :)

• moves internal config api to core module
• removes remaining usages of YamlConfig in code; tests should use yamlConfig
• removes implementation dependency snakeyaml from api module
• removes BaseConfig; it's members are now plain functions

[codecov]

Codecov Report

Merging #3163 into master will decrease coverage by 0.00%.
The diff coverage is 96.15%.

@@             Coverage Diff              @@
##             master    #3163      +/-   ##
============================================
- Coverage     79.51%   79.51%   -0.01%     
+ Complexity     2599     2587      -12     
============================================
  Files           437      437              
  Lines          7865     7864       -1     
  Branches       1497     1498       +1     
============================================
- Hits           6254     6253       -1     
  Misses          817      817              
  Partials        794      794              

Impacted Files	Coverage Δ	Complexity Δ
...otlin/io/gitlab/arturbosch/detekt/core/Analyzer.kt	67.64% <ø> (ø)	6.00 <0.00> (ø)
...b/arturbosch/detekt/core/config/CompositeConfig.kt	66.66% <ø> (ø)	5.00 <0.00> (?)
...ab/arturbosch/detekt/core/config/Configurations.kt	83.33% <ø> (ø)	0.00 <0.00> (ø)
...lab/arturbosch/detekt/core/config/DefaultConfig.kt	100.00% <ø> (ø)	2.00 <0.00> (ø)
...kt/core/config/DefaultPropertiesConfigValidator.kt	100.00% <ø> (ø)	1.00 <0.00> (ø)
...ch/detekt/core/config/DisabledAutoCorrectConfig.kt	44.44% <ø> (ø)	5.00 <0.00> (?)
...ab/arturbosch/detekt/core/config/FailFastConfig.kt	36.36% <ø> (ø)	5.00 <0.00> (?)
...sch/detekt/core/config/ValidatableConfiguration.kt	96.87% <ø> (ø)	0.00 <0.00> (?)
...gitlab/arturbosch/detekt/core/config/YamlConfig.kt	76.00% <ø> (ø)	9.00 <0.00> (?)
...gitlab/arturbosch/detekt/core/config/BaseConfig.kt	96.15% <96.15%> (ø)	0.00 <0.00> (?)
... and 1 more

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