fix(pinia-orm): Serialization was wrong with custom cast with custom serialization

[Graphmaxer]

🔗 Linked issue

Resolves #1864

📚 Description

When updating an existing entry in a repository, the casts are not applied if the value is a class object with custom serlize.
Now $getAttributes() checks if an object has a custom serialize function which is then used.

[Graphmaxer]

The fix 4ecf93f for $dirty is not working with this change

[CodeDredd]

Yeah your change will break $isDirty() for updating hooks. I need to look into it and think about an solution. Going to check out your branch

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.76%. Comparing base (ed747cb) to head (52a8844).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1866   +/-   ##
=======================================
  Coverage   99.76%   99.76%           
=======================================
  Files          88       88           
  Lines        6032     6044   +12     
  Branches      512      515    +3     
=======================================
+ Hits         6018     6030   +12     
  Misses         12       12           
  Partials        2        2           

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