Adding sts chat sample source using openai

[hogaku]

Purpose

• To try a  Speech to Speech chat using OpenAI System immediately available for testing.

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

What to Check

Verify that the following are valid

pip install -r requirement.txt
python openai-speech.py

Other Information

Hi @paragagrawal11 , thank you for sharing your wonderful repository. When you have time, could you please review and merge this Pull Request? CC: @achandmsft
Please let me know if you have any questions or concerns.
Thank you!