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 :warning:

Additional details and impacted files

```diff @@ 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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