feat: Add Base64 Audio Config to Video API Audio Connector implementation

[superchilled]

This PR adds support for the audio_transport params within an Audio Connector Websocket configuration in the Video API implementation. Specifically it:

• Updates an existing unit test for the method to include the new params
• Updates the camelcase method of the Keys module to include the audio_transport param
• Updates the YARD doc comments for the method to include the new params

This PR completes https://jira.vonage.com/browse/DEVX-11291

[Copilot]

Pull request overview

Adds support for configuring audio_transport within the Video API Audio Connector WebSocket configuration so callers can send an audioTransport object in the request payload.

Changes:

• Expanded WebSocket#connect unit test coverage to include audio_transport options.
• Updated Vonage::Keys.camelcase exception handling so audio_transport is converted to audioTransport.
• Added YARD documentation for :audio_transport options on WebSocket#connect.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
test/vonage/video/web_socket_test.rb	Extends request/parameter expectations for audio_transport in connect.
lib/vonage/video/web_socket.rb	Documents newly supported :audio_transport configuration options.
lib/vonage/keys.rb	Ensures audio_transport is camel-cased to audioTransport in outgoing payloads.

Suppressed comments (1)

test/vonage/video/web_socket_test.rb:73

• The client-side websocket options passed into connect use snake_case for nested audio_transport keys, but other nested option hashes in this SDK are expected to use the API's camelCase keys (see transcription_properties usage in test/vonage/video/archives_test.rb:55-63). Aligning these keys avoids ambiguity about whether the SDK will deep-camelcase nested hashes.

          transport: 'json',
          encoding: 'base64',
          audio_field: 'audio',
          receive_audio_field: 'audio',
          static_fields: {

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