[ENHANCEMENT]: Optimize the authentication configuration of the kafka input plugin

[xuzhijvn]

Concisely describe the proposed feature

The current authentication configuration of the Kafka input plugin is very simple

Describe the solution you'd like (if any)

I plan to extract the authentication configuration of the Kafka flusherV2 plugin into the pkg directory as a public configuration that can be used by both the Kafka input and Kafka flusherV2 plugins.