Reaction highlights (#1145)

* Highlight own reactions

- Highlight own reactions on timeline and improve style.
- Highlight reactions on message bottom sheet only when it our own.

* Improve overlay background colours

* pin to new sdk version

* Remove the red used for debug.

* Fix padding, overlap and only display count if > 1.

- Fix reaction padding and overlap of reaction and bubble.
- Only display count if greater than 1.
- Return EmptyView for TimelineDeliveryStatus.cancelled.

* Fix colors as per design recommendations.

* Add Snapshot tests for reactions and documentation.

- Add UITests for the timeline including reactions.
- Add the reference snapshots.
- Add documentation on how to run snapshot tests and update the reference snapshots.

* Fix Package.resolved

ElementX/Sources/Services/Timeline/TimelineItems/RoomTimelineItemFactory.swift

@@ -322,7 +322,7 @@ struct RoomTimelineItemFactory: RoomTimelineItemFactoryProtocol {
     
     private func aggregateReactions(_ reactions: [Reaction]) -> [AggregatedReaction] {
         reactions.map { reaction in
-            let isHighlighted = false // reaction.details.contains(where: { $0.sender.id == userID })
+            let isHighlighted = reaction.senders.contains(where: { $0 == userID })
             return AggregatedReaction(key: reaction.key, count: Int(reaction.count), isHighlighted: isHighlighted)
         }
     }