Enhancing Log Agent Server with Multi-Instance Deployment Capability

[goodjava]

Currently, the log agent server is responsible for communication with all log agents (and maintaining heartbeats), but due to the underlying RPC mechanism, it is a single-point application. We will provide a PR to solve this problem, allowing the log agent server to be deployed in multiple instances.

[wtt40122]

I hope that the underlying layers of RPC and Dubbo can be specified to one of the machines through a load balancing algorithm, rather than having all configurations on the machines every day. I hope to support this