feat: Add audio subscription control to HumanInput

[boussaidev]

Add a new should_subscribe_to_audio parameter to control when the agent subscribes to participant audio tracks. This can be either a boolean or a callback function that takes a RemoteTrackPublication and returns a boolean, allowing for fine-grained control over audio track subscriptions.

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[boussaidev]

This PR implements the feature requested in #1399
#1399