fix(dojo-bindgen): array length before array items

[Larkooo]

add array length to calldata before adding the serialized array items

[codecov]

Codecov Report

Attention: Patch coverage is 36.36364% with 14 lines in your changes missing coverage. Please review.

Project coverage is 68.36%. Comparing base (34b13ca) to head (d675fd3).

Files	Patch %	Lines
crates/dojo-bindgen/src/plugins/unity/mod.rs	36.36%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2060      +/-   ##
==========================================
- Coverage   68.37%   68.36%   -0.01%     
==========================================
  Files         326      326              
  Lines       40566    40574       +8     
==========================================
+ Hits        27735    27740       +5     
- Misses      12831    12834       +3     

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[glihm]

Any test we can add here or in a subsequent PR? :)

[Larkooo]

Any test we can add here or in a subsequent PR? :)

It's a bit hard as it would involve doing a full integration test where we would;

katana & migrate -> compile unity code -> run the c# in some way -> use dojo.c -> check if error from katana 😅