Add class-level javadoc to HAETAE JCE provider classes, mirroring the

convention HAWK established for new BCPQC algorithms (HaetaeParameterSpec,
HaetaeKey, Haetae mappings, BCHaetae{Public,Private}Key, HaetaeKeyFactorySpi,
HaetaeKeyPairGeneratorSpi, SignatureSpi).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>