Provide a priority field for DetektProvider

[arturbosch]

This makes it easier for tools (e.g. IntelliJ plugin) to choose their provider implemention (e.g. in tests).

One usecase can be found here:

https://github.com/detekt/detekt-intellij-plugin/pull/177/files#diff-3c40938670e13746dcbdadc52f2b01f6fbfbefd6153bd152bf0e69d4c233fd0fR122

[codecov]

Codecov Report

Merging #4923 (9e863ff) into main (9146e4d) will decrease coverage by 0.00%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##               main    #4923      +/-   ##
============================================
- Coverage     84.83%   84.83%   -0.01%     
  Complexity     3512     3512              
============================================
  Files           497      497              
  Lines         11549    11552       +3     
  Branches       2139     2140       +1     
============================================
+ Hits           9798     9800       +2     
  Misses          686      686              
- Partials       1065     1066       +1     

Impacted Files	Coverage Δ
...lin/io/github/detekt/tooling/api/DetektProvider.kt	83.33% <75.00%> (-16.67%)	⬇️

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[BraisGabin]

It is good to see you around :p