Publishes a reliable data message. VERIFY: (payload: Uint8Array, options).
Optionaloptions: unknownRecordPublishes a track (the bot's voice, or its avatar camera). VERIFY: returns a publication / Promise.
Optionaloptions: RtcTrackPublishOptionsOptionalsetSets the bot's own attributes (its token must allow canUpdateOwnMetadata). VERIFY: setAttributes(record).
OptionalunpublishTakes a published track down. VERIFY: unpublishTrack(trackSid, stopOnUnpublish?).
OptionalstopOnUnpublish: boolean
The bot's local participant — its publish surface.