[PR] Add ML-KEM (FIPS 203) post-quantum key transport supp ort [santuario-xml-security-java]

ffang opened a new pull request, #652:
URL: https://github.com/apache/santuario-xml-security-java/pull/652

   Adds ML-KEM-512/768/1024 key transport via the W3C "XML Security: Generic Hybrid Cipher" structure, on both the DOM and STAX encryption paths. Part of the post-quantum work tracked under SANTUARIO-634 (originally proposed in SANTUARIO-633 / apache/santuario-xml-security-java#645), split out here as the encryption-only half per community request.
   
   Adds negative-test coverage on both the DOM and STAX paths: decryption with the wrong recipient's ML-KEM private key fails cleanly, and a truncated EncryptedKey CipherValue is rejected via the existing length check in KeyUtils#kemDecapsulate. Added per Arpan0995's review feedback on #645.


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