Add user search for dm chats (#739)

* Add searchUsers in ClientProxy

* Add UserSearchProtocol

* Delete UserSearch file

* Add search

* Refine StartChatScreen

* Improve StartChatViewModel

* Add localizations

* Fix no result style

* Update localizations

* Add UTs

* Add UI tests

* Cleanup

* Refine tests

* Add changelog.d file

* Naming refactor

* Refactor ClientProxyProtocol api

* Fix typo

* Add mark

* Rename tests

* Update Dangerfile

* Improve UI test code

* Refactor search api

* Improve style

* Improve combine chain

* Add comment

* Improve StartChatScreen

* Improve updateState

* Add extension Published.Publisher

* Improve UI tests

* Remove Combine import

* Cleanup

* Remove “proxy” wording

* Delete extra extensions

* Refactor Publisher api

ElementX/Sources/Other/AccessibilityIdentifiers.swift

@@ -101,6 +101,7 @@ struct A11yIdentifiers {
     struct StartChatScreen {
         let closeStartChat = "start_chat-close"
         let inviteFriends = "start_chat-invite_friends"
+        let searchNoResults = "start_chat-search_no_results"
     }
 
     struct RoomMemberDetailsScreen {

ElementX/Sources/Other/Extensions/Publisher.swift

@@ -23,3 +23,17 @@ extension Publisher where Self.Failure == Never {
         }
     }
 }
+
+extension Published.Publisher {
+    /// Returns the next output from the publisher skipping the current value stored into it (which is readable from the @Published property itself).
+    /// - Returns: the next output from the publisher
+    var nextValue: Output? {
+        get async {
+            var iterator = values.makeAsyncIterator()
+            
+            // skips the publisher's current value
+            _ = await iterator.next()
+            return await iterator.next()
+        }
+    }
+}