WidgetDriver: Add to-device widget driver support (without encryption) #4963
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The widget Driver should be able to send and receive to-device events. This is useful for element call encryption keys.
This PR focusses on the widget driver and machine logic. To send/communicate the events from the widget to the driver.
It skips any encryption logic. Some of the encryption logic will be part of crypto crate and the code in the widget driver crate should be kept minimal once the crypto crate is ready.