Add VideoSDK.live audio transport support to Pipecat

[DeepBhupatkar]

This PR introduces the VideoSDK.live Audio Transport into the pipecat-ai/pipecat framework, allowing Pipecat-ai bots to join VideoSDK.live meetings, exchange realtime audio with participants, and respond to participant chat messages via VideoSDK PubSub.

1.Added Dependency :

• Add the VideoSDK.live transport implementation dependency
• Updated pyproject.toml to include the VideoSDK Python SDK:
  videosdk = ["videosdk>=0.2.7"]

2.Environment Variables :

• Added new VideoSDK.live environment variables to env.example:

# VideoSDK.live
VIDEOSDK_AUTH_TOKEN=...
VIDEOSDK_MEETING_ID=...

3.VideoSDK's Transport Implementation :

• Added a new videosdk folder inside the transports directory to organize all VideoSDK.live transport components.

src/pipecat/transports/videosdk/
├── __init__.py        # placeholder
└── transport.py       # VideoSDKTransport implementation

Features include:

• Realtime bidirectional audio (incoming & outgoing)
• Meeting join and authentication logic
• Audio pipeline integration with Pipecat
• Support for VideoSDK.live meeting and functinoality like chat.

4.New Example Added :

• Added a full usage example demonstrating VideoSDK.live audio transport:
  examples/foundational/04c-transports-videosdk.py
• This example shows how to initialize the transport and run a complete STT → LLM → TTS audio pipeline.

[DeepBhupatkar]

Hi @markbackman,@filipi87 & @aconchillo - This PR is ready for review.Please review when possible.