feat: Implement audio playback from URL

[SyedaAnshrahGillani]

Background

The _process_audio_block method in the AgentBase class included a TODO comment to implement playback of audio from a URL. This functionality was missing, limiting the agent's ability to handle audio content provided as a web link.

Purpose

This pull request implements that missing feature, enabling agents to process and play audio directly from a URL.

Changes Made

This PR enhances the _process_audio_block method to support audio sources from URLs. The changes include:

• Using the urllib.request module to download the audio file from the given URL.
• Storing the downloaded audio content in a temporary file.
• Employing the wave module to read the audio data from the temporary file.
• Utilizing the sounddevice library to play the audio.
• Incorporating error handling to gracefully manage potential issues during download or playback.

How to Test

1. Create an agent that receives a message containing an audio block with a source type of "url".
2. The URL should point to a valid .wav file.

Example message content:

{
  "type": "audio",
  "source": {
    "type": "url",
    "url": "https://example.com/path/to/audio.wav"
  }
}

Checklist

Please verify the following before marking the PR ready for review:

• Code has been formatted with pre-commit run --all-files
• All tests are passing
• Docstrings follow Google style
• Related documentation has been updated (e.g., links, examples, etc.)
• Code is ready for review

[DavdGao]

It looks good to me, and thank you for your contribution