Support debug port in gateway plugin

### 🚀 Feature Description and Motivation

service discovery is commonly misconfigured by users. However, we do not have every straightforward ways to help user diagnose the problem.

The most easiest way I can come up with is to provide a debug interface and expose the endpoint information. for deployment, model to pod list mapping is good. lora is same. for StormService, we need to list the roles

### Use Case

gateway plugin

### Proposed Solution

_No response_