Breaking changes addressed:
* Make `MatrixClient.getNotificationSettings()` async, cache its result.
* Use `RoomInfo` for accessing the updated room's info.
* Refactor `MatrixRoom` so it always receives an initial `MatrixRoomInfo` value: this value will be used to make `MatrixRoom.roomInfoFlow` a `StateFlow` so we can assume the initial updated Room data will be present.
* Fetch encryption state when loading a room if it's unknown
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