chore(spaces): add changelog

Author: stefanceriu

crates/matrix-sdk-ui/CHANGELOG.md

@@ -7,6 +7,9 @@ All notable changes to this project will be documented in this file.
 ## [Unreleased] - ReleaseDate
 
 ### Features
+- Add a new [`SpaceService`] that provides high level reactive interfaces for listing 
+  the user's joined top level spaces as long as their children.
+  ([#5509](https://github.com/matrix-org/matrix-rust-sdk/pull/5509))
 - Add `new_filter_low_priority` and `new_filter_non_low_priority` filters to the room list filtering system,
   allowing clients to filter rooms based on their low priority status. The filters use the `Room::is_low_priority()` 
   method which checks for the `m.lowpriority` room tag.