simplify webrtc bindings

[theomonnom]

Simplify WebRTC bindings

Examples that can be re-worked

• play_from_desk
• save_to_disk
• basic_text_stream
• encrypted_text_stream
• rpc
• local_audio
• screenshring
• wgpu_room
• send_bytes
• basic_room
• agent_dispatch
• livekit_ffi

[coderabbitai]

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