Add support for local participants to update own metadata (#599)
* Add support for local participants to update own metadata
* add method and event for name update
* emit room level events
* Update src/room/Room.ts
Co-authored-by: David Zhao <dz@livekit.io>
* Create short-bags-drive.md
* super setMetadata
* update protocol
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Co-authored-by: David Zhao <dz@livekit.io>