Add SIP Participant SIP endpoint status code on participant_joined & participant_disconnected events

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Please just add sip status code to the webhook and room event we receive when a SIP participant join or disconnect so we could behave on our SIP endpoints as we want without relying solely on Livekit events. For example you could add "sip_status_code" on participant_joined and disconnected events if it's a SIP participant.

For production use case we want to infer deeply on the SIP status code to modify our workflow and take decision. Not only if participant has "SIP_TRUNK_FAILURE", while this disconnect_reason is never reachable from room events.

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I really think this would be the best details we could get for a SIP workflow.