Add HiSuite 14 PMS split AES-GCM support

[RRoenn]

Summary

Add support for newer HiSuite / LocalBackup application-data backups using the PMS split format.

This format was observed with HiSuite / LocalBackup 14.7.0.240 (backupVersion=31) and stores application data as multiple encrypted TAR parts:

<package>.tar.0
<package>.tar.1
<package>.tar.2
...

The matching BackupFileModuleInfo entry contains isPmsSplit=true.

Encryption

For PMS split application data, each part is decrypted independently using:

• PBKDF2-HMAC-SHA256
• 10,000 iterations
• 256-bit key
• AES-256-GCM
• salt and nonce from encMsgV3
• final 16 bytes of each split file as the GCM authentication tag

Each part is authenticated with decrypt_and_verify() before its plaintext is accepted.

After successful authentication, the decrypted parts are concatenated to reconstruct the original TAR archive.

Behavior

• Existing legacy HiSuite / KoBackup decryption remains unchanged.
• PMS split packages are detected by <package>.tar.<number> together with isPmsSplit=true.
• Split parts are sorted numerically and checked for missing parts.
• Without -e, the reconstructed archive is written as:
  data/data/<package>.tar
• With -e, the reconstructed TAR is extracted to:
  data/data/<package>/
• Nested info.xml files are skipped by the generic Multimedia XML parser, as they are backup metadata rather than Multimedia XML files.

Tests

Added synthetic tests covering:

• successful AES-GCM decryption and reconstruction of a multi-part TAR
• GCM authentication failure with an incorrect password
• parsing of Boolean XML values such as isPmsSplit

All tests pass:

Ran 3 tests
OK

The implementation was also validated end-to-end against a real HiSuite / LocalBackup 14.7.0.240 backup containing three PMS split application-data parts. All parts authenticated successfully and reconstructed into a valid TAR archive which was extracted successfully.