Ui Events

[TiagoJacobs]

We want to create a new hook in the plugin API that's the useUiEvent.

This hook will allow the plugin to register to an ui event and react to it.

Initial events to be implemented:

• USER_LIST_OPENED
• USER_LIST_CLOSED
• CHAT_INPUT_CHANGED (event payload: new text)
• CHAT_INPUT_FOCUSED
• CHAT_INPUT_UNFOCUSED