Add audio pipeline architecture documentation and improve audio persistence worker configuration

- Introduced a comprehensive documentation file detailing the audio pipeline architecture, covering data flow, processing stages, and key components.
- Enhanced the audio persistence worker setup by implementing multiple concurrent workers to improve audio processing efficiency.
- Adjusted sleep intervals in the audio streaming persistence job for better responsiveness and event loop yielding.
- Updated test script to run the full suite of integration tests from the specified directory, ensuring thorough testing coverage.

Author: AnkushMalaker