Implement MSC3846: Allowing widgets to access TURN servers (#9061)
* Implement MSC3819: Allowing widgets to send/receive to-device messages
* Don't change the room events and state events drivers
* Implement MSC3846: Allowing widgets to access TURN servers
* Update to latest matrix-widget-api changes
* Support sending encrypted to-device messages
* Yield a TURN server immediately
* Use queueToDevice for better reliability
* Update types for latest WidgetDriver changes
* Upgrade matrix-widget-api
* Add tests
* Test StopGapWidget
* Fix a potential memory leak
* Add tests
* Empty commit to retry CI
28ed87bffe