Conversation demo (testing new microphone and speaker)

[jingxiangmo]

Problem Description

We want to create a conversation demo with the new Z-Bot and de-risk the onboard microphone and speaker.

Steps / Requirements

1. Record audio (microphone) for 5 seconds and play back what was recorded (audio for 5 seconds using milk-v via Python
2. Conversation demo on the robot with OpenAI API
3. Refactor OpenLCH start, play, and stop recording to KOS as a Rust Cargo Crate

Links

• KOS https://github.com/kscalelabs/kos
• OpenLCH sts_server audio: https://github.com/zeroth-robotics/zeroth-bot/blob/fd2f9a3996055bd10acb93f6e6209523bc49803c/runtime/src/bin/sts_server.rs#L716