[feat][client] Expose OAuth2 mTLS client options - #505

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, actions/setup-node@v3, actions/setup-python@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'topicMetadata' is defined but never used

'message' is defined but never used

'messageConsumer' is defined but never used

'message' is defined but never used

'messageConsumer' is defined but never used

'message' is defined but never used

Test has no assertions

'reader' is defined but never used

'message' is defined but never used