Add support for universal LLMContext to NVIDIA NIM LLM service

src/pipecat/services/nim/llm.py

@@ -47,15 +47,6 @@ class NimLLMService(OpenAILLMService):
         self._has_reported_prompt_tokens = False
         self._is_processing = False
 
-    @property
-    def supports_universal_context(self) -> bool:
-        """Check if this service supports universal LLMContext.
-
-        Returns:
-            False, as NimLLMService does not yet support universal LLMContext.
-        """
-        return False
-
     async def _process_context(self, context: OpenAILLMContext):
         """Process a context through the LLM and accumulate token usage metrics.