Display a badge for messages decrypted using shared keys. (#4937)

* feat: Show info badge for messages decrypted with shared keys

* tests: Add snapshots and tests for forwarder icon.

* fix: Update `EventBasedTimelineItemProtocol.hasStatusIcon`

* fix: Address review comments.

* fix: Use two translations for key forwarded dialog content.

* refactor: Rename `TimelineItemForwarder` to `TimelineItemKeyForwarder`.

Additionally adds a `[weak self]` guard to `encryptionForwarder` alert
handler.

* tests: Add `previewLayout` directive to `encryptionForwarder` previews

* refactor: Remove unused translations, use short-circuiting condition.

ElementX/Sources/Screens/Timeline/TimelineModels.swift

@@ -138,6 +138,8 @@ struct TimelineViewState: BindableState {
     var linkMetadataProvider: LinkMetadataProviderProtocol?
     
     var mapTilerConfiguration: MapTilerConfiguration
+
+    var enableKeyShareOnInvite: Bool
     
     var bindings: TimelineViewStateBindings
 }
@@ -196,6 +198,7 @@ enum TimelineAlertInfoType: Hashable {
     case pollEndConfirmation(String)
     case sendingFailed
     case encryptionAuthenticity(String)
+    case encryptionForwarder(String)
 }
 
 struct RoomMemberState {