Add --version option to testing tools

[miles170]

Closes #892

• evmone-t8n --version
• evmone-statetest --version
• evmone-blockchaintest --version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.26%. Comparing base (f44466e) to head (d343577).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #902   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files         130      130           
  Lines       15673    15675    +2     
=======================================
+ Hits        15401    15403    +2     
  Misses        272      272           

Flag	Coverage Δ
ethereum-tests	27.89% <100.00%> (+0.01%)	⬆️
ethereum-tests-silkpre	19.65% <100.00%> (+<0.01%)	⬆️
execution-spec-tests	18.99% <100.00%> (+0.01%)	⬆️
unittests	94.13% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
test/blockchaintest/blockchaintest.cpp	87.50% <100.00%> (+0.26%)	⬆️
test/statetest/statetest.cpp	92.30% <100.00%> (+0.15%)	⬆️
test/t8n/t8n.cpp	86.36% <100.00%> (ø)