This pulls the 3PID state management in Settings up to a single location so that the Account and Discovery sections now work from a single list that updates immediately. Fixes https://github.com/vector-im/riot-web/issues/10519
...if the user has bound threepids Fixes https://github.com/vector-im/riot-web/issues/10550
This adds controls for each 3PID to allow the user to choose whether it's bound on the IS. Fixes https://github.com/vector-im/riot-web/issues/10159