Share extension (#3506)

* Setup simple share extension

* Switch the app url scheme to be the full bundle identifier

* Setup a share extension that show a SwiftUI view, uses rust tracing and redirects to the hosting aplication

* Move media as json through the custom scheme into the main app and deep link into the media upload preview screen

* Fix message forwarding and global search screen room summary provider filtering.

* Tweak the message forwarding and global search screen designs.

* Add a room selection screen to use after receiving a share request from the share extension

* Fix share extension entitlements

* Share the temporary directory between the main app and the extensions; rename the caches one.

* Remove the no longer needed notification avatar flipping fix.

* Extract the placeholder avatar image generator from the NSE

* Nest `AvatarSize` within the new `Avatars` enum

* Donate an `INSendMessageIntent` to the system every time we send a message so they appear as share suggestions

* Support suggestions in the share extension itself

* Improve sharing animations and fix presentation when room already on the stack

* Clear all routes when sharing without a preselected room.

* Fix broken unit tests

* Various initial tweaks following code review.

* Correctly clean up and dismiss the share extension for all paths.

* Move the share extension path to a constants enum

* Rename UserSessionFlowCoordinator specific share extension states and events

* Add UserSession and Room flow coordinator share route tests

* Tweak the share extension logic.

ElementX/Sources/Screens/GlobalSearchScreen/View/GlobalSearchScreenCell.swift

@@ -16,8 +16,8 @@ struct GlobalSearchScreenListRow: View {
     
     var body: some View {
         ZStack { // The list row swallows listRowBackgrounds for some reason
-            ListRow(label: .avatar(title: room.name,
-                                   description: room.alias ?? room.id,
+            ListRow(label: .avatar(title: room.title,
+                                   description: room.description,
                                    icon: avatar),
                     kind: .label)
         }
@@ -42,8 +42,8 @@ struct GlobalSearchScreenListRow_Previews: PreviewProvider, TestablePreview {
     static var previews: some View {
         List {
             GlobalSearchScreenListRow(room: .init(id: "123",
-                                                  name: "Tech central",
-                                                  alias: "The best place in the whole wide world",
+                                                  title: "Tech central",
+                                                  description: "The best place in the whole wide world",
                                                   avatar: .room(id: "123",
                                                                 name: "Tech central",
                                                                 avatarURL: .picturesDirectory)),