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/MessageForwardingScreen/MessageForwardingScreenViewModel.swift

@@ -45,8 +45,11 @@ class MessageForwardingScreenViewModel: MessageForwardingScreenViewModelType, Me
             .map(\.bindings.searchQuery)
             .removeDuplicates()
             .sink { [weak self] searchQuery in
-                guard let self else { return }
-                self.roomSummaryProvider.setFilter(.search(query: searchQuery))
+                if searchQuery.isEmpty {
+                    self?.roomSummaryProvider.setFilter(.all(filters: []))
+                } else {
+                    self?.roomSummaryProvider.setFilter(.search(query: searchQuery))
+                }
             }
             .store(in: &cancellables)
         
@@ -79,8 +82,10 @@ class MessageForwardingScreenViewModel: MessageForwardingScreenViewModelType, Me
                 continue
             }
             
-            let room = MessageForwardingRoom(id: summary.id, name: summary.name, alias: summary.canonicalAlias, avatar: summary.avatar)
-            rooms.append(room)
+            rooms.append(.init(id: summary.id,
+                               title: summary.name,
+                               description: summary.roomListDescription,
+                               avatar: summary.avatar))
         }
         
         state.rooms = rooms