Autodetect unsafe allocations metadata for native images

[riccardobl]

This extends the native image plugin to generate metadata for detected patterns of unsafe allocations in jme apps (currently only used by SafeArrayList in the engine) and to allow the dev to whitelist custom classes for this scope.

The bytecode parsing logic was made by gpt 5.5

[gemini-code-assist]

Code Review

This pull request introduces support for detecting and configuring unsafe allocations in the JMonkeyEngine Native Image Gradle plugin. It adds an allowUnsafeAllocation property to the @PreserveReflection annotation, implements bytecode analysis to automatically detect constructions of unsafe allocation containers (such as SafeArrayList), and provides configuration options to explicitly define unsafe allocated types and container types. There are no review comments, so no additional feedback is provided.

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