cov tx utils

[Eikix]

closes #706

[codecov]

Codecov Report

Attention: Patch coverage is 75.72816% with 25 lines in your changes missing coverage. Please review.

Project coverage is 66.72%. Comparing base (bee0671) to head (56dc553).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
cairo/ethereum/cancun/transactions_types.cairo	80.85%	18 Missing ⚠️
cairo/ethereum/cancun/fork.cairo	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #710      +/-   ##
==========================================
+ Coverage   66.44%   66.72%   +0.27%     
==========================================
  Files          88       88              
  Lines       20433    20433              
==========================================
+ Hits        13577    13634      +57     
+ Misses       6856     6799      -57     

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