feat(kafka-queue): plain|scram-sha-256|scram-sha-512 mechanism config support

[wintbiit]

Greptile Summary

This review covers only the changes made since the last review (commit 8cce566), not the entire PR.

The latest changes address the critical issue identified in the previous review by adding a proper default case to the SASL mechanism switch statement. The developer has implemented a robust error handling approach that returns a descriptive error message when an unsupported mechanism is encountered, preventing the potential runtime panic that could have occurred from passing a nil mechanism to the Kafka dialer.

The implementation now properly validates all mechanism values at runtime, complementing the existing compile-time validation tags in the configuration struct. This change ensures that any configuration errors are caught early in the queue creation process with clear error messaging, maintaining the integrity of the Kafka connection establishment flow.

Confidence score: 5/5

• This PR is now safe to merge with minimal risk
• Score reflects the resolution of the critical nil mechanism issue and robust error handling
• No files require special attention as the implementation is now complete and secure

[greptile-apps]

_{3 files reviewed, 1 comment}

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[greptile-apps]

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[wintbiit]

支持了 sasl.mechanism=SCRAM-SHA-512 和 sha256 的 kafka 连接认证，默认使用 plain 与原先逻辑不冲突，使用无需更改. plz review @kevwan .