python_client: Avoid async in playback callback, use thread async for prebuffer, reduce blocksize and latency, keep minimal threshold and gain.

Fix bug on log in python_client

Use log instead of print for python_client, remove audio stats print

Add audio output file save on client too for checking

Revise python_client to handle proper playback FIFO buffering audio buffering. Still needs tweak for smoothing.

Change default client sample rate to 16k

Formatting black, isort, flake8

Enhanced docstrings, type hints, and comments

Add project files