feat: default code offset = 3

[bout3fiddy]

What I did

Set default code offset for blueprint contracts to 3

How I did it

Just change the default value from zero_value (which is IRnode.from_list(0, typ=UINT256_T)) to IRnode.from_list(3, typ=UINT256_T).

How to verify it

Added a test that simply uses no code_offset for initcode with the EIP5202 magic val appended at the top

Commit message

Sets default code offset to 3 (instead of 0).

Description for the changelog

Update: Sets default code offset to 3 (instead of 0).

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[charles-cooper]

hmm i think this breaks some tests, also needs a docs update

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7bdebbf) 84.93% compared to head (bea6a63) 84.89%.
Report is 14 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3454      +/-   ##
==========================================
- Coverage   84.93%   84.89%   -0.05%     
==========================================
  Files          92       92              
  Lines       13685    13734      +49     
  Branches     3074     3078       +4     
==========================================
+ Hits        11623    11659      +36     
- Misses       1572     1586      +14     
+ Partials      490      489       -1     

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[charles-cooper]

alright i fixed the tests and updated the docs. since this is a breaking change (and we don't really want to break user code with 'patch' changes), going to hold off on this until the 0.4.0 series.

also i'm not a huge fan of the duplicated code in the new test case - it would be nice to think of a way around that.

[charles-cooper]

i fixed the merge conflicts and updated the test so it passes. @pcaversaccio @fubuloubu want to take a look in case i missed anything?