[ISSUE] doctest fix WIP

[vipyne]

Attempting to fix the pytests - starting with doctests...

run with
pytest --doctest-modules -v src/pipecat/processors/aggregators/user_response.py

this (now) produces the error:

>>> asyncio.run(print_frames(aggregator, UserStartedSpeakingFrame()))
UNEXPECTED EXCEPTION: TypeError("'async for' requires an object with __aiter__ method, got coroutine")

I tried an await in the offending line async for frame in aggregator.process_frame(frame, FrameDirection.DOWNSTREAM): but the tests still don’t pass because they never print anything.

anyone know how to update def print_frames to fix this (and alllll the other tests that also use it)?