Refactor MPT implementation to get more precise code coverage

[chfast]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.26%. Comparing base (ae53163) to head (89dabe4).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1341   +/-   ##
=======================================
  Coverage   87.25%   87.26%           
=======================================
  Files         169      169           
  Lines       24976    24970    -6     
  Branches     4107     4107           
=======================================
- Hits        21792    21789    -3     
+ Misses        529      526    -3     
  Partials     2655     2655           

Flag	Coverage Δ
eest-develop	79.93% <100.00%> (+0.02%)	⬆️
eest-develop-gmp	15.96% <100.00%> (-0.01%)	⬇️
eest-legacy	11.20% <100.00%> (-0.01%)	⬇️
eest-legacy-silkpre	17.65% <100.00%> (-0.01%)	⬇️
evmone-unittests	83.82% <100.00%> (+<0.01%)	⬆️

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Components	Coverage Δ
core	93.62% <100.00%> (+0.03%)	⬆️
tooling	88.08% <ø> (ø)
tests	84.14% <ø> (ø)

Files with missing lines	Coverage Δ
test/state/mpt.cpp	98.94% <100.00%> (+2.90%)	⬆️

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[hadlojen-dev]

It's hard, and I don't have the workers.