feat: enable CODEOWNERS

[rrsettgast]

This PR adds the CODEOWNERS file which will be used for enforcing reviews by specific individuals (code owners) on specific subdirectories.

@castelletto1 @CusiniM @herve-gross @TotoGaz @paveltomin please look at the file and submit changes.

[CusiniM]

I am just suggesting a few additions. I wonder if we should always have at least 2 ppl so that we are never blocked by someone's absence (e.g., someone goes on vacation for 2 weeks).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.75%. Comparing base (94a0e86) to head (618b2fb).
Report is 89 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3205   +/-   ##
========================================
  Coverage    55.75%   55.75%           
========================================
  Files         1041     1041           
  Lines        88534    88534           
========================================
  Hits         49358    49358           
  Misses       39176    39176           

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[paveltomin]

@rrsettgast is it possible to disable that for drafts?

[MelReyCG]

@paveltomin isn't it already "silenced" for draft? I think we only see the codeowners on drafts, but don't actually send notifications.

[paveltomin]

@paveltomin isn't it already "silenced" for draft? I think we only see the codeowners on drafts, but don't actually send notifications.

I am not sure if it is silenced or not, sorry
I just saw people getting added as reviewers for drafts and got confused if that will trigger notifications for them