Support lora loading/unloading support in SGLang

### 🚀 Feature Description and Motivation

SGLang provides the lora loading/unloading interface. https://github.com/sgl-project/sglang/blob/main/python/sglang/multimodal_gen/docs/openai_api.md 

let's add the lora support for sglang as well.

part of https://github.com/vllm-project/aibrix/issues/1818

### Use Case

for SGLang users

### Proposed Solution

_No response_