feat: Add Base64 Audio Config to Audio Connector

[superchilled]

This PR updates the Audio Connector implementation in the Video package to add configuration options for Audio Transport. Specifically it:

• Defines a new AudioTransportConfiguration data model for setting the Audio Transport configuration options
• Updates the existing AudioConnectorWebSocket data model to include the audio_transport parameter
• Defines enums for AudioTransportEncoding and AudioTransportTransport
• Adds a new unit test for setting the Audio Transport configuration options
• Updates the import lists in __init.py

[Copilot]

Pull request overview

This PR extends the Video package’s Audio Connector request models to support configuring Audio Transport (e.g., JSON + Base64) and adds test coverage for the new configuration payload.

Changes:

• Added AudioTransportConfiguration model and new enums (AudioTransportEncoding, AudioTransportTransport) to represent audio transport settings.
• Extended AudioConnectorWebSocket to accept an audio_transport configuration and updated exports in models/__init__.py.
• Updated unit tests to cover serialization of Audio Transport configuration.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
video/tests/test_audio_connector.py	Adds/updates tests for serializing Audio Connector options, including the new audio_transport config.
video/src/vonage_video/models/enums.py	Introduces enums for audio transport encoding and transport type.
video/src/vonage_video/models/audio_connector.py	Adds AudioTransportConfiguration and wires it into AudioConnectorWebSocket.
video/src/vonage_video/models/__init__.py	Exposes the new model and enums at the package level.

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