support telechat2 model

[shunxing12345]

Motivation

support telechat2 model

Modifications

support telechat2 model

Checklist

• Format your code according to the Code Formatting with Pre-Commit.
• Add unit tests as outlined in the Running Unit Tests.
• Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling.

[zhyncs]

add unit test for this new model

[zhyncs]

ref https://github.com/sgl-project/sglang/blob/main/test/srt/models/test_qwen_models.py

[shunxing12345]

ref https://github.com/sgl-project/sglang/blob/main/test/srt/models/test_qwen_models.py

Thank you for your feedback! I will add the unit test for the new model as soon as possible. 😊