Create a new room in a space (#6061)
* Add `SpaceService.editableSpaces` and `SpaceService.addChildToSpace`
* Add `parentSpace` to `CreateRoomConfig`
* Allow setting a parent space to a room in `ConfigureRoomPresenter`, make sure the room is added to the parent space when creating it
* `ConfigureRoomPresenter`: Load the list of possible spaces a room can be added to
* Refactor `RoomVisibilityState` to internally use `JoinRuleItem`
This gets rid of `RoomAccess` and `RoomAccessItem`, and it will allow us to map the join rule items in a cleaner way to both join rules and the UI
* Implement the UI changes:
- Display the parent space.
- Allow selecting a new one.
- Import needed strings.
* Fix existing tests
* Add `@Immutable` annotation to `SpaceRoom`, since it was detected as unstable.
Maybe because of `RoomType`?
* Update screenshots
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Co-authored-by: ElementBot <android@element.io>
