Support encryption context on Message

[BewareMyPower]

No description provided.

[Copilot]

Pull request overview

This PR adds support for exposing encryption context information on Message objects in the Pulsar Python client. This allows applications to access encryption and compression metadata for messages, particularly useful when handling encrypted messages that fail to decrypt.

Key changes:

• Exposed EncryptionKey and EncryptionContext classes from C++ bindings to Python
• Added encryption_context() method to the Message class that returns encryption metadata or None for non-encrypted messages
• Enhanced encryption failure tests to verify encryption context information including keys, compression type, batch size, and decryption status

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
src/message.cc	Exports EncryptionKey and EncryptionContext C++ classes to Python bindings and adds encryption_context() method to Message class
pulsar/init.py	Adds Python wrapper classes for EncryptionKey and EncryptionContext with comprehensive documentation and properties for accessing encryption metadata
tests/pulsar_test.py	Adds test coverage for encryption_context() on both encrypted and non-encrypted messages, including verification of encryption metadata fields

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