Fixes #978 - Message forwarding support

* Add support for message forwarding

* Move the TimelineProvider within the RoomProxy to avoid it going out of sync and have it automatically register for timeline updates on init

* Implement single selection form button style for message forwarding

* Add searching and filter out the source room from the list

* Fixed emoji screen initial search bar height

* Add view models tests

* Add changelog

* Update strings

* Tweaks following code review

ElementX/Sources/Screens/RoomScreen/View/TimelineItemMenu.swift

@@ -37,6 +37,7 @@ enum TimelineItemMenuAction: Identifiable, Hashable {
     case copyPermalink
     case redact
     case reply
+    case forward(itemID: String)
     case viewSource
     case retryDecryption(sessionID: String)
     case report
@@ -193,6 +194,10 @@ public struct TimelineItemMenu: View {
                 Button { send(action) } label: {
                     MenuLabel(title: L10n.actionReply, systemImageName: "arrowshape.turn.up.left")
                 }
+            case .forward:
+                Button { send(action) } label: {
+                    MenuLabel(title: L10n.actionForward, systemImageName: "arrowshape.turn.up.right")
+                }
             case .redact:
                 Button(role: .destructive) { send(action) } label: {
                     MenuLabel(title: L10n.actionRemove, systemImageName: "trash")