Ignore JVM array descriptors when packaging HiveMQ extensions

[sci-jvm-study]

What does this PR do?

Fixes #10074.

'HiveMQExtension' currently ignores only object array descriptors ('[L') when collecting classes from Javassist's constant pool.

However, 'ConstPool#getClassNames()' may also return primitive array descriptors such as '[B'. These are JVM descriptors rather than fully qualified class names, so passing them to 'JavaArchive.addClass(String)' results in a 'PatternSyntaxException'.

This change ignores all JVM array descriptors by checking for '[' instead of only '[L'.

Changes

• Ignore all JVM array descriptors returned from the constant pool when packaging additional classes
• Add a regression test covering a primitive array descriptor ('[B')
• Add a helper test class that generates a primitive array descriptor in the constant pool

Testing

• Reproduced the reported 'PatternSyntaxException' before the fix
• Verified that the regression test fails with the original implementation
• Verified that the regression test passes after the fix