core: introduce Domovoi hardfork

[AnnaShaleva]

It's time. Depends on neo-project/neo#3290.

• Update the documentation once dependent PR is finalized.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 86.11%. Comparing base (836183e) to head (e5a6e9c).
Report is 10 commits behind head on master.

Files	Patch %	Lines
pkg/config/hardfork_string.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3476      +/-   ##
==========================================
- Coverage   86.12%   86.11%   -0.02%     
==========================================
  Files         331      331              
  Lines       38473    38484      +11     
==========================================
+ Hits        33135    33139       +4     
- Misses       3807     3813       +6     
- Partials     1531     1532       +1     

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[AnnaShaleva]

@roman-khimov, documentation doesn't contain any additional logic links. I'll add them in the related PRs, and the current PR just introduces the hardfork itself.