Fury does not preserve script/extensions following serialise/deserialise

### Search before asking

- [x] I had searched in the [issues](https://github.com/apache/fory/issues) and found no similar issues.

### Version

Fury only serialises the language/country/variant fields of a Locale, ignoring any script/extensions, resulting in an inconsistent values following deserialisation.

### Component(s)

Java

### Minimal reproduce step

On my machine:
```
Fory fory = Fory.builder().withLanguage(Language.JAVA).build();
for (Locale locale : Locale.getAvailableLocales()) {
Locale deserialised = fory.deserialize(fory.serialize(locale));
assertEquals(locale, deserialised); // This fails for locales that define a script or extensions
}
```

### What did you expect to see?

Assertions should pass.

### What did you see instead?

The assertion fails for any locale that defines a script or extensions.

### Anything Else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start with Fury's Java serialization handling for java.util.Locale and run the provided round-trip over Locale.getAvailableLocales(). Ensure the round-tripped Locale equals the original for locales with scripts or extensions, while preserving the existing language, country, and variant behavior.

Written by the indexing model from the issue text.