Abstract Common Code in UnmodifiableListDeserializer and UnmodifiableSetDeserializer

[hyunmin0317]

The goal of this PR is to abstract the common logic found in UnmodifiableListDeserializer and UnmodifiableSetDeserializer to improve maintainability.
To achieve this, an abstract class AbstractUnmodifiableCollectionDeserializer has been introduced to handle shared deserialization logic.

Summary of Changes:

• Abstract Class Created:
  • Introduced AbstractUnmodifiableCollectionDeserializer to centralize the common JSON deserialization logic and collection element addition.
  • This abstract class uses a generic type to handle various collection types such as List and Set.
• Class Refactoring:
  • Refactored UnmodifiableListDeserializer and UnmodifiableSetDeserializer to extend the new abstract class.
  • Moved duplicated logic into the abstract class methods, reducing redundancy and improving readability.

Thank you for reviewing this pull request!

[jzheaux]

Thanks, @hyunmin0317! This is now merged into main.