Add a test for the Creator Contract

[pdobacz]

The Creator Contract is a hot topic rn, so here is a simple test of a manual, bytecode implementation I prepared. The implementation is as simple as possible, yet aligned with the pseudocode one from https://github.com/ipsilon/eof/blob/main/spec/eof.md#appendix-creator-contract

The bytecode implementation could be linked up from the megaspec if necessary, or copy-pasted into EIP-7620 - unless we decide to not have the Creator Contract in the end.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.29%. Comparing base (17c09c7) to head (0cf6c5b).

Additional details and impacted files

@@               Coverage Diff               @@
##           eof-create4     #856      +/-   ##
===============================================
+ Coverage        98.28%   98.29%   +0.01%     
===============================================
  Files              123      124       +1     
  Lines            14724    14854     +130     
===============================================
+ Hits             14471    14601     +130     
  Misses             253      253              

Flag	Coverage Δ
statetests	59.55% <ø> (ø)
statetests-silkpre	19.34% <0.00%> (+0.18%)	⬆️
unittests	97.14% <100.00%> (+0.02%)	⬆️

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Files	Coverage Δ
...st/unittests/state_transition_eof_creator_test.cpp	100.00% <100.00%> (ø)

[pdobacz]

Closing, as ipsilon/eof#78 just got merged