In version 1.4.1, modify the "Server is Down" prompt to the specific reason for the machine failure and send it to the user

[realJackSun]

1.4.1版本中，将“Server is Down"的提示，修改成机器失效的具体原因，传给用户
In version 1.4.1, modify the "Server is Down" prompt to the specific reason for the machine failure and send it to the user

Issue Description

目前在jRaft集群初始化出现问题之后，只会抛给用户一个“Server is Down”的异常，希望可以把该异常修改为具体的初始化错误原因。
At present, after a problem occurs in the initialization of the jRaft cluster, only a "Server is Down" exception will be thrown to the user. I hope that the exception can be modified to the specific cause of the initialization error.

Describe what you expected to happen

期望可以把该异常修改为具体的初始化错误原因。
I hope that the exception can be modified to the specific cause of the initialization error.

Tell us your version

Nacos1.4.1

[realJackSun]

@i will fix it@