evm-bench.py script

[chfast]

Adds evm-bench.py script to help benchmarking external EVM implementations.

[codecov[bot]]

Codecov Report

Merging #396 (64286cb) into master (ac7e3b1) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 64286cb differs from pull request most recent head d14ec93. Consider uploading reports for the commit d14ec93 to get more accurate results

@@           Coverage Diff           @@
##           master     #396   +/-   ##
=======================================
  Coverage   99.67%   99.67%           
=======================================
  Files          31       31           
  Lines        3967     3967           
=======================================
  Hits         3954     3954           
  Misses         13       13           

Flag	Coverage Δ
consensus	89.06% <ø> (ø)
unittests	99.67% <ø> (ø)

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