Simplify the creation of Config

[BraisGabin]

This PR just cleans the configuration code and moves the functions to where they should be declared. The next step would be to make those internal functions private and test all that code as a one unit. But I will leave that for later or for anyone willing to contribute.

Waiting for #6844

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 84.70%. Comparing base (0641174) to head (fbb26e0).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...itlab/arturbosch/detekt/core/ProcessingSettings.kt	66.66%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6848      +/-   ##
============================================
- Coverage     84.71%   84.70%   -0.02%     
  Complexity     3975     3975              
============================================
  Files           576      575       -1     
  Lines         12140    12131       -9     
  Branches       2497     2495       -2     
============================================
- Hits          10285    10276       -9     
  Misses          621      621              
  Partials       1234     1234              

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[BraisGabin]

Blocked by #7054

[schalkms]

Looks good!
Since this PR is around 1 month old, I would prefer rebasing to latest and if everything runs fine, merge it to main.