feat(gemini): add text handling to GeminiMultimodalLive

- Introduce text attribute in Part class for handling string data.
- Incorporate text processing in GeminiMultimodalLiveLLMService to push TextFrame if text is present.

src/pipecat/services/gemini_multimodal_live/events.py

@@ -105,6 +105,7 @@ class InlineData(BaseModel):
 
 class Part(BaseModel):
     inlineData: Optional[InlineData] = None
+    text: Optional[str] = None
 
 
 class ModelTurn(BaseModel):

src/pipecat/services/gemini_multimodal_live/gemini.py

@@ -604,6 +604,11 @@ class GeminiMultimodalLiveLLMService(LLMService):
         part = evt.serverContent.modelTurn.parts[0]
         if not part:
             return
+
+        text = part.text
+        if text:
+            await self.push_frame(TextFrame(text=text))
+
         inline_data = part.inlineData
         if not inline_data:
             return