Improve FontData Copying: Replace String Constructor with Safer Approach

[ShahzaibIbrahim]

Currently, we use the FontData(String) constructor to create a deep copy of a FontData object. Although this works per the API contract, it is not a robust or future-proof approach. To improve safety and maintainability, we should introduce a dedicated copy constructor like FontData(FontData) or a createCopy() method. This will ensure clearer intent and reduce the risk of errors if the internal behavior of FontData(String) changes.