EVM: cleanup error messages and fix styling

[jochem-brouwer]

Closes #3986

WIP, TODOs:

• Remove unused error messages in EOFError error message map
• Move the EVMErrorMessages object into the EVMError constructor class as a static field
• Verify that the casing of error-related params like EvmErrorResult are correct (should be EVMErrorResult)
• Make errorType on EVMError a constant somewhere and export it such that is reads from that variable? Then if we change it in the future, we don't run in the similar problem

[codecov]

Codecov Report

Attention: Patch coverage is 61.00000% with 78 lines in your changes missing coverage. Please review.

Project coverage is 79.52%. Comparing base (20cae2b) to head (9671973).
Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
block	83.34% <ø> (ø)
blockchain	89.32% <ø> (ø)
client	67.95% <ø> (ø)
common	97.51% <ø> (ø)
devp2p	86.78% <ø> (ø)
evm	73.03% <61.00%> (-0.07%)	⬇️
mpt	89.71% <ø> (-0.06%)	⬇️
statemanager	69.08% <ø> (ø)
static	99.11% <ø> (ø)
tx	90.59% <ø> (ø)
util	89.53% <ø> (ø)
vm	55.17% <ø> (ø)

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[jochem-brouwer]

LGTM! I just realized that I opened this PR so I can't approve it 😅

[holgerd77]

LGTM