Implement streaming audio Websocket

[NeonDaniel]

Description

Implements a WS API for streaming raw audio (input and output) with a per-client listener running in the backend

Issues

Other Notes

• Consider implementing streaming response audio

  Implemented. Stream socket handles chunked audio input and sends wav audio segments, all as bytes.

• Consider WW config and included plugins

  Global configuration will be used (at least initially). Plugins will match neon-speech defaults.

• Consider configuring max allowed clients to prevent overloading the backend server with listener instances

  Implemented in configuration with unit test coverage