Update trl/chat template utils.py to support the new response-parsing API in transformers 5.13+, while…

Update trl/chat template utils.py to support the new response-parsing API in transformers 5.13+, while…: a task in HF ML Tasksmith (Harbor dataset). Module-level flag Add SUPPORTS RESPONSE TEMPLATE (a bool ) at module level, set to True when the installed transformers version is = 5.13.0.dev0…