chore: Refactor struct message generation

[jawoznia]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.43860% with 14 lines in your changes missing coverage. Please review.

Project coverage is 82.24%. Comparing base (4c5a678) to head (3263d69).

Files	Patch %	Lines
...ia-derive/src/contract/communication/struct_msg.rs	76.59%	11 Missing ⚠️
sylvia-derive/src/parser/mod.rs	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
- Coverage   82.30%   82.24%   -0.06%     
==========================================
  Files          53       53              
  Lines        3113     3098      -15     
==========================================
- Hits         2562     2548      -14     
+ Misses        551      550       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[kulikthebird]

Looks good! Only one comment related to the change of the generated message structure. Also it seems like this change can be breaking