chore: delete unused code in src

[Eikix]

• delete os, model, state, memory, stack, instructions, error, interpreter
• rename src to legacy
• keep utils in legacy

closes #639

[Eikix]

fixed ci

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.15%. Comparing base (efd5d86) to head (82c5373).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #701      +/-   ##
==========================================
+ Coverage   71.29%   80.15%   +8.85%     
==========================================
  Files          87       55      -32     
  Lines       19125    12263    -6862     
==========================================
- Hits        13636     9829    -3807     
+ Misses       5489     2434    -3055     

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