Make error naming in evm uniform

[scorbajio]

This change does the following:

• EOFError key names are all made to be capital snakecase
• SimpleError key names are all made to be capital snakecase
• The main error map for the evm is made to be camel case as are EOFError and SimpleError (so ERROR -> EVMError and the type named ERROR -> EVMErrorType)
• The name of the file containing all of the main error codes for the evm is renamed from exceptions.ts to errors.ts to be more consistent with the file naming used for the eof errors

[codecov]

Codecov Report

Attention: Patch coverage is 62.33766% with 145 lines in your changes missing coverage. Please review.

Project coverage is 79.64%. Comparing base (d6d3858) to head (b58590e).

Additional details and impacted files

Flag	Coverage Δ
block	83.29% <ø> (ø)
blockchain	89.33% <ø> (ø)
client	68.10% <ø> (ø)
common	98.49% <ø> (ø)
devp2p	86.73% <ø> (ø)
evm	72.99% <62.33%> (+0.01%)	⬆️
genesis	99.98% <ø> (ø)
mpt	89.71% <ø> (-0.06%)	⬇️
rlp	91.43% <ø> (ø)
statemanager	69.16% <ø> (ø)
tx	90.58% <ø> (ø)
util	81.96% <ø> (ø)
vm	57.20% <ø> (ø)
wallet	88.55% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[holgerd77]

Would cautiously think this looks good, but will leave it to Jochem for a final review!