Refactor whitespace and formatting in multiple files

- Clean up unnecessary whitespace in `gemini.py`, `events.py`, and `file_api.py`
- Ensure consistent formatting in `26g-gemini-multimodal-live-groundingMetadata.py`
- Improve readability by aligning code and removing trailing spaces

examples/foundational/26g-gemini-multimodal-live-groundingMetadata.py

@@ -162,4 +162,4 @@ async def run_example(transport: BaseTransport, _: argparse.Namespace, handle_si
 if __name__ == "__main__":
     from pipecat.examples.run import main
 
-    main(run_example, transport_params=transport_params) 
+    main(run_example, transport_params=transport_params)