Java25 support

[Voyinno]

Add Java 25 Support

Summary

This PR adds support for Java 25 (class file version 69) to yGuard, including:

• Accept major version 69 class files
• Handle the new ACC_IDENTITY flag (shares bit value with ACC_SUPER)
• Recognize, parse, and remap the new LoadableDescriptors attribute (preview feature)

Related Issues

Addresses issue 153

[thomasbehr]

@Voyinno Thank you very much for your effort. It seems your work is based on this preliminary list of todos. However, as far as I can tell neither ACC_IDENTITY nor LoadableDescriptors made it into Java 25 (at least I can find no mention of either the access flag or the attribute in The Java Virtual Machine Specification, Java SE 25 Edition). But maybe that is because ACC_IDENTITY and LoadableDescriptors are preview features.
Can you maybe share actual Java code snippets and the corresponding compiler commands to generate class files that use ACC_IDENTITY or LoadableDescriptors or both?

[Fohlen]

A bit of an oddball but for security reasons GitHub does not run CI on foreign commits. We should run all examples to verify these changes @thomasbehr

[yGuy]

This was likely a bot-generated PR. The OP does not answer, the implementation looks like it was just using my preliminary todo list and did not check whether this is actually implemented. We can probably ignore it.

What model were you using @Voyinno ?

[Voyinno]

Hi, Apologies for the late response. @yGuy I used Claude Opus 4.5 to draft the initial PR and then modified it myself, but I ended up pushing the wrong branch with the unverified changes.
I updated the commits.

[thomasbehr]

Manually merged pull request after testing changes locally.