fix(pinia-orm): Get mutators were wrong for updated models

[CodeDredd]

🔗 Linked issue

related #1818

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

The get mutators & casts were still wrong for updated data. Now there is a design change for model properties who have casts or mutators. The performance will be a bit slower in some edge cases because shadow props are now introduced.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 99.67%. Comparing base (76eb4a5) to head (99df5da).

Files	Patch %	Lines
packages/pinia-orm/src/model/Model.ts	96.77%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1824   +/-   ##
=======================================
  Coverage   99.67%   99.67%           
=======================================
  Files          87       87           
  Lines        5900     5923   +23     
  Branches      500      505    +5     
=======================================
+ Hits         5881     5904   +23     
- Misses         16       17    +1     
+ Partials        3        2    -1     

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