feat: add code hash to storage account

[obatirou]

Time spent on this PR:

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Resolves #1267

What is the new behavior?

• code hash is added to model.Account
• it is computed only once when creating a contract account

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This change is 

[enitrat]

lgtm

[codecov]

Codecov Report

Attention: Patch coverage is 82.89474% with 13 lines in your changes missing coverage. Please review.

Project coverage is 68.02%. Comparing base (a41fe3b) to head (ed6c1db).

Files	Patch %	Lines
src/kakarot/account.cairo	77.58%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1309      +/-   ##
==========================================
+ Coverage   67.96%   68.02%   +0.05%     
==========================================
  Files          46       46              
  Lines        6868     6930      +62     
==========================================
+ Hits         4668     4714      +46     
- Misses       2200     2216      +16     

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[obatirou]

Blocked until a PR is done in EF-test to set the code hash in pre state.