Setup FOSSA

[cortinico]

I'm delegating the FOSSA Setup to a Github Actions workflow.
This will work on post-merge to main.

Once this gets merged, I'll update the FOSSA Badge on the README as the one we have right now is pointing to a project that has 0 dependencies: https://app.fossa.io/projects/git%2Bgithub.com%2Farturbosch%2Fdetekt/refs/branch/master/091dc917cd3bac0b8a47793ab63e2216be2252e2/preview

[codecov]

Codecov Report

Merging #3836 (9ad3d36) into main (8a8d790) will not change coverage.
The diff coverage is n/a.

❗ Current head 9ad3d36 differs from pull request most recent head 9aeccd8. Consider uploading reports for the commit 9aeccd8 to get more accurate results

@@            Coverage Diff            @@
##               main    #3836   +/-   ##
=========================================
  Coverage     83.58%   83.58%           
  Complexity     3110     3110           
=========================================
  Files           456      456           
  Lines          8931     8931           
  Branches       1748     1748           
=========================================
  Hits           7465     7465           
  Misses          551      551           
  Partials        915      915           

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