feat(java): add Google Tink AEAD detection rules

[Chennamma-Hotkar]

Summary

Adds detection rules for Google Tink's AEAD (Authenticated Encryption
with Associated Data) primitive in Java. Tink is one of the most widely
used Java cryptography libraries and currently has no detection coverage
in this plugin.

Changes

• TinkAead.java: detect KeysetHandle.generateNew() for four AEAD
  key templates with Aead.encrypt() and Aead.decrypt() as depending rules
• TinkDetectionRules.java: aggregates all Tink detection rules
• TinkAeadTestFile.java: Java test file using real Tink 1.21.0 API
• TinkAeadTest.java: unit test verifying detection and translation
• JavaDetectionRules.java: registers TinkDetectionRules in rule aggregator
• JavaAbstractLibraryTranslator.java: adds "Tink" bundle dispatch
• JavaCipherContextTranslator.java: maps Tink AEAD templates to AES model nodes
• java/pom.xml: adds com.google.crypto.tink:tink:1.21.0 as test dependency

Key templates detected

• AeadKeyTemplates.AES128_GCM
• AeadKeyTemplates.AES256_GCM
• AeadKeyTemplates.AES128_CTR_HMAC_SHA256
• AeadKeyTemplates.AES256_CTR_HMAC_SHA256

Testing

• 157 tests pass (was 156 before)
• mvn spotless:check passes
• mvn -B clean package -pl java passes

Follow-up PR

• Mac.computeMac() / Mac.verifyMac() — HMAC detection
• HybridEncrypt.encrypt() / HybridDecrypt.decrypt() — hybrid encryption
• PublicKeySign.sign() / PublicKeyVerify.verify() — digital signatures
• DeterministicAead operations
• Additional key templates (ChaCha20Poly1305, AES-SIV, hybrid templates)

[Chennamma-Hotkar]

Closing in favor of #407, which now contains all Tink detection
rules (AEAD, Mac, Hybrid, Signature) in a single self-contained
commit. No code is lost — #407 is the complete Tink contribution.