Add addChildToSpace method to SpaceService

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/spaces/SpaceService.kt

@@ -23,6 +23,14 @@ interface SpaceService {
 
     fun getLeaveSpaceHandle(spaceId: RoomId): LeaveSpaceHandle
 
+    /**
+     * Add a child room to a space.
+     * @param spaceId The space ID to which the child will be added.
+     * @param childId The room ID of the child to add.
+     * @return A result indicating success or failure.
+     */
+    suspend fun addChildToSpace(spaceId: RoomId, childId: RoomId): Result<Unit>
+
     /**
      * Remove a child room from a space.
      * @param spaceId The space ID from which to remove the child.