feat(Dart): update Freezed generation to use abstract classes #2854
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Description
Update Freezed code generation to use abstract classes for primary constructors, following the latest Freezed guidelines.
See: https://pub.dev/packages/freezed#primary-constructors
Related Issue
#2825
Motivation and Context
Recent versions of freezed require primary constructors to be defined in abstract classes.
This change ensures compatibility with newer Freezed versions.
Previous Behaviour / Output
Generated Freezed classes used concrete classes with primary constructors.
New Behaviour / Output
Generated Freezed classes now use abstract classes with primary constructors.
How Has This Been Tested?
Verified generated code compiles with the latest freezed.
Confirmed code generation works as expected.