seata-discovery-raft augment health check

[funky-eyes]

Why you need it?

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seata-discovery-raft 增加健康检查功能，因为discovery-raft中目前是通过随机读取一个follower节点来watch和pull元数据，但是由于没有健康检查，导致可能某个follower挂了，依旧会将请求发到该follower上，而且如果所有节点都下线了，上线后server的ip全部改变，也会导致client无法获取元数据，所以应该针对初始的initaddress，和拉取到的元数据做一个集合来健康检查，这样init address就可以是一个安全可靠的内部lb地址，即便server全挂了ip改变，最终也可以通过这个init address重新加载到元数据。

To add a health check feature to seata-discovery-raft, consider the following:

Currently, discovery-raft reads metadata by randomly selecting a follower node to watch and pull data. However, without health checks, requests may still be sent to a follower node that is down. Additionally, if all nodes go offline and come back online with changed IP addresses, clients may not be able to retrieve metadata. To address this, a health check mechanism should be implemented for the initial initAddress and the metadata retrieved. This way, the initAddress can be a reliable internal load balancer address, ensuring that even if all servers are down and IP addresses change, the metadata can be reloaded through this initAddress.

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[heliang666s]

please assign to me.I want to solve it.

[funky-eyes]

please assign to me.I want to solve it.

Okay, looking forward to your PR. You can refer to the current health check design for the naming server nodes in seata-discovery-namingserver。

[SAIVARDHAN15]

hey @heliang666s, are you working on this ?
if its open to work on.. I am good to go with it

[funky-eyes]

Hello @heliang666s, are you currently working on this task? How is the progress going?