feat[test]: add hevm equivalence tests

[cyberthirst]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.35%. Comparing base (94cf162) to head (cce17b7).
Report is 5 commits behind head on master.

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@@            Coverage Diff             @@
##           master    #4339      +/-   ##
==========================================
+ Coverage   92.27%   92.35%   +0.08%     
==========================================
  Files         123      123              
  Lines       17520    17499      -21     
  Branches     2961     2949      -12     
==========================================
- Hits        16166    16162       -4     
+ Misses        946      933      -13     
+ Partials      408      404       -4     

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[cyberthirst]

i'll rewrite this using the new hevm test machinery and then we can merge

[cyberthirst]

I decided the remove the hevm_check_vyper fixture and just keep the logic localized for the test. if we ever need it in a general form, we can lift it then