text: Title: [Feature] Add examples for token in token out for LLM
  Body: ### Checklist
  
  - [x] 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
  - [x] 2. Please use English, otherwise it will be closed.
  
  ### Motivation
  
  Refer to this file:
  
  `test/srt/test_skip_tokenizer_init.py`
  
  write an example here:
  
  `examples/runtime/engine`
  
  And link it here:
  
  <img width="1086" alt="Image" src="https://github.com/user-attachments/assets/25af5dc4-d9bf-46f3-822f-79d9993afa1b" />
  
  ### Related resources
  
  _No response_