chore(jca): add ECDH KeyAgreement JNI binding

[mfazrinizar]

Summary

Adds JNIgen coverage for javax.crypto.KeyAgreement, required by the JNI/JCA ECDH implementation.

The generated API exposes the operations needed by the JCA backend:

• KeyAgreement.getInstance("ECDH")
• init(privateKey)
• doPhase(publicKey, true)
• generateSecret()

The first commit updates only the reproducible JNIgen configuration. The second commit contains only regenerated output. No JCA backend implementation is included.

Regeneration

bash tool/update-jca-bindings.sh

Generated with JDK 17 and Android SDK Platform 36. Regenerating a second time produced the same checksum and no additional changes.

Testing

dart format --output=none --set-exit-if-changed .
dart analyze
dart run jni:setup  # if the desktop JNI helper is not already available
dart test test/impl_jni_digest_test.dart test/impl_jni_hmac_test.dart test/impl_jni_aesgcm_test.dart test/impl_jni_aescbc_test.dart test/impl_jni_aesctr_test.dart test/impl_jni_rsassapkcs1v15_test.dart test/impl_jni_rsaoaep_test.dart test/impl_jni_rsapss_test.dart
git diff --check