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>

tests/konsist/src/test/kotlin/io/element/android/tests/konsist/KonsistComposableTest.kt

@@ -28,6 +28,7 @@ class KonsistComposableTest {
             .functions()
             .withTopLevel()
             .withoutModifier(KoModifier.PRIVATE)
+            .withoutModifier(KoModifier.INTERNAL)
             .withoutNameEndingWith("Preview")
             .withAllAnnotationsOf(Composable::class)
             .withoutReceiverType()