test: Convert example tests to TestState API

[chfast]

No description provided.

[chfast]

If you are working with state tests, there is new TestState API you should be using. The API is actually std::map.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.29%. Comparing base (b2d0672) to head (e9aec04).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #968   +/-   ##
=======================================
  Coverage   94.29%   94.29%           
=======================================
  Files         143      143           
  Lines       16131    16132    +1     
=======================================
+ Hits        15210    15211    +1     
  Misses        921      921           

Flag	Coverage Δ
eof_execution_spec_tests	16.64% <0.00%> (-0.01%)	⬇️
ethereum_tests	26.93% <0.00%> (-0.01%)	⬇️
ethereum_tests_silkpre	18.69% <0.00%> (-0.01%)	⬇️
execution_spec_tests	17.73% <0.00%> (-0.01%)	⬇️
unittests	89.72% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
test/unittests/state_transition_call_test.cpp	100.00% <100.00%> (ø)