chore: improve session recording, error handling

[Ruthvik-1411]

Resolves Issue #37
Changelog:

1. Modifications on client side to display timestamps for logs, pass custom parameters via websocket.
2. Use New session button to create a new session and establish new websocket connection.
3. Improve the session recording to overlay user and model audio at the right intervals to resemble real audio recording.
4. Add pydub recording as an async task to non block other tasks.
5. Improved exception handling for all tasks.

Future improvements:

1. Could add end_call feature where bot can end the call by itself.