Cpp support lite

[zhaohai666]

Cpp support lite push

[RockteMQ-AI]

Review by github-manager-bot

Summary

Adds "lite push consumer" and "lite producer" support to the C++ client, including new APIs, subscription management, and examples.

Findings

• [Info] This is a large feature PR (2539 additions, 39 files). The changes span CMake/Bazel build configs, new header/source files, examples, and tests.
• [Info] LitePushConsumer / LitePushConsumerImpl — New consumer type with simplified API. Thread safety annotations (GUARDED_BY, LOCKS_EXCLUDED) are used consistently.
• [Info] LiteSubscriptionManager — Manages subscriptions for lite push consumer. Includes unit tests.
• [Info] thread_annotations_compat.h — Compatibility header for abseil thread safety macros. Good approach for supporting both old and new abseil versions.
• [Warning] The PR description is very brief ("Cpp support lite"). Consider adding more detail about:
  • What "lite" means in this context (lightweight? simplified API?)
  • How it differs from the existing PushConsumer
  • Any protocol-level changes or new gRPC methods
• [Warning] OffsetOption.h — New file. Ensure the offset option semantics are documented and consistent with other language clients.
• [Info] Tests — LiteMessageTest.cpp and LiteSubscriptionManagerTest.cpp provide coverage for the new functionality.

Suggestions

• Expand the PR description to explain the "lite" concept and its relationship to existing consumer types.
• Consider adding a README or design doc for the lite push consumer feature.
• Cross-repo: If "lite" is a new protocol feature, ensure the Proxy side (apache/rocketmq) supports it.

Overall: Significant feature addition with good test coverage. The brief description makes it harder to review, but the code quality appears solid.

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Automated review by github-manager-bot