mroccyen

## What is the purpose of the change XXXXX ## Brief changelog XX ## Verifying this change XXXX

The plugin module adds code comments and optimizes the code format

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## What is the purpose of the change XXXXX ## Brief changelog XX ## Verifying this change XXXX

## What is the purpose of the change this PR fix issue #232 ## Brief changelog XX ## Verifying this change XXXX

如图所示，GrpcHepler#getPaasServerHost方法如果获取不到配置，应该返回一个默认值或者是直接抛异常，如果直接返回null的话，在创建grpc channel会直接抛异常，这样不是很友好，感觉可以修改一下

## What is the purpose of the change this PR fix issue #188 ## Brief changelog XX ## Verifying this change XXXX

[Feature] Support websocket protocol

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### Search before asking - [X] I had searched in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found no similar issues. ### Feature Request Support websocket protocol. ### Are you willing to submit PR?...

### Search before asking - [X] I had searched in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found no similar issues. ### Enhancement Request 'ConfigMonitorService' can use jdk 'WatchService' to monitor config change ###...