Add an empty state for the space screen if the user can modify its graph (#6064)

* Add an empty state for the space screen if the user can modify its graph. It adds a new 'create room' button that allows you to open the create room screen with some preset values.

* When computing the editable spaces in `ConfigureRoomPresenter`, also set up the initial selected parent space if possible

* Use `Builder` pattern for `CreateRoomEntryPoint`

* Update screenshots

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Co-authored-by: ElementBot <android@element.io>

features/createroom/api/src/main/kotlin/io/element/android/features/createroom/api/CreateRoomEntryPoint.kt

@@ -15,12 +15,13 @@ import io.element.android.libraries.architecture.FeatureEntryPoint
 import io.element.android.libraries.matrix.api.core.RoomId
 
 interface CreateRoomEntryPoint : FeatureEntryPoint {
-    fun createNode(
-        isSpace: Boolean,
-        parentNode: Node,
-        buildContext: BuildContext,
-        callback: Callback,
-    ): Node
+    interface Builder {
+        fun setIsSpace(isSpace: Boolean): Builder
+        fun setParentSpace(parentSpaceId: RoomId): Builder
+        fun build(): Node
+    }
+
+    fun builder(parentNode: Node, buildContext: BuildContext, callback: Callback): Builder
 
     interface Callback : Plugin {
         fun onRoomCreated(roomId: RoomId)