examples: update with single FunctionCallParams parameter

examples/foundational/15-switch-voices.py

@@ -20,6 +20,7 @@ from pipecat.processors.aggregators.openai_llm_context import OpenAILLMContext
 from pipecat.processors.filters.function_filter import FunctionFilter
 from pipecat.services.cartesia.tts import CartesiaTTSService
 from pipecat.services.deepgram.stt import DeepgramSTTService
+from pipecat.services.llm_service import FunctionCallParams
 from pipecat.services.openai.llm import OpenAILLMService
 from pipecat.transports.base_transport import TransportParams
 from pipecat.transports.network.small_webrtc import SmallWebRTCTransport
@@ -31,10 +32,10 @@ load_dotenv(override=True)
 current_voice = "News Lady"
 
 
-async def switch_voice(function_name, tool_call_id, args, llm, context, result_callback):
+async def switch_voice(params: FunctionCallParams):
     global current_voice
-    current_voice = args["voice"]
-    await result_callback(
+    current_voice = params.arguments["voice"]
+    await params.result_callback(
         {
             "voice": f"You are now using your {current_voice} voice. Your responses should now be as if you were a {current_voice}."
         }