core: Implement block dominance

[PapyChacal]

Thought I wanted to use the concept, realized I do not right now, but figured I might as well open the PR.

Free bikeshedding:

I like rethinking vocabulary that I find a bit outdatedly heavy on the tone, like how we finally call the default branch main rather than master. Anyone has ideas on a name sounding right but lighter than "dominance"?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.81%. Comparing base (4b44800) to head (b5d5d1f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2790      +/-   ##
==========================================
- Coverage   89.81%   89.81%   -0.01%     
==========================================
  Files         391      393       +2     
  Lines       48567    48619      +52     
  Branches     7436     7448      +12     
==========================================
+ Hits        43620    43665      +45     
- Misses       3780     3783       +3     
- Partials     1167     1171       +4     

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[math-fehr]

Nice, thanks a lot ;)