Reaction summary and flow layout for reactions (#1158)

* Add reaction summary view

* Add avatars and display names and flowlayout for reactions

- Add avatars to summary view
- Add display names to summary view
- Add flow layout to reaction buttons as per designs(long press on  scolling buttons is difficult to achieve so prioritised this).

* Add and use SwiftUI-Flow for reaction layout.

* Correct Swift-Flow inclusion via xcodegen

* Remove own FlowLayout implementation and Fix unit tests

* Improve naming and correct spacing on summary view as per design.

* Fix safe area insets on summary view bottom sheet

* Scroll to selected reaction in the case that it is offscreen when the sheet is displayed.

* Add more reactions to UITests to ensure the new flow layout is displayed(wraps on to second line).

* Fix snapshot image.

* Address review comments.

* Use onLongPressGesture for reactions also to fix double actions bug and for consistency.

* Respect RTL languages.

* Fix unit test.

ElementX/Sources/Screens/RoomScreen/RoomScreenModels.swift

@@ -73,6 +73,8 @@ enum RoomScreenViewAction {
     
     case handlePasteOrDrop(provider: NSItemProvider)
     case tappedOnUser(userID: String)
+    
+    case reactionSummary(itemID: String, key: String)
 
     case retrySend(transactionID: String?)
     case cancelSend(transactionID: String?)
@@ -126,6 +128,8 @@ struct RoomScreenViewStateBindings {
     var actionMenuInfo: TimelineItemActionMenuInfo?
 
     var sendFailedConfirmationDialogInfo: SendFailedConfirmationDialogInfo?
+    
+    var reactionSummaryInfo: ReactionSummaryInfo?
 }
 
 struct TimelineItemActionMenuInfo: Identifiable, Equatable {
@@ -146,6 +150,15 @@ struct SendFailedConfirmationDialogInfo: ConfirmationDialogProtocol {
     let transactionID: String?
 }
 
+struct ReactionSummaryInfo: Identifiable {
+    let reactions: [AggregatedReaction]
+    let selectedKey: String
+    
+    var id: String {
+        selectedKey
+    }
+}
+
 enum RoomScreenErrorType: Hashable {
     /// A specific error message shown in an alert.
     case alert(String)