matrix-js-sdk

4b4ba861 - Add `Relations.add` event for additional relations in collection

Add `Relations.add` event for additional relations in collection This adds a `Relations.add` event that consumers can listen for to be notified each time an additional relation event is added to a relations collection. Part of https://github.com/vector-im/riot-web/issues/9485 Part of https://github.com/vector-im/riot-web/issues/9572