feat: add real time playing script

[maxreciprocate]

This PR adds a proof of concept script for playing turn-by-turn with aria model.

To try, run the following (currently only works on mac, tested on m1 max):

git clone https://github.com/maxreciprocate/aria.git -b add-real-time-playing
cd aria
pip install -e .
cd aria
python play_real_time.py

Demo:

https://github.com/EleutherAI/aria/assets/56548574/35f2381b-3c5a-4939-bb80-56408b443937

[CLAassistant]

All committers have signed the CLA.