Show or create direct message room (#716)

* add start chat flow with UI

* add feature flag for start chat

* add changelog

* fix naming and tests

* fix empty display name in user cell

* Update ElementX/Sources/Application/AppSettings.swift

Co-authored-by: Alfonso Grillo <alfogrillo@element.io>

* add screenshots from UI test

* fix swiftFormat and add identifiers

* fix warnings

* add the create or open already existing direct room feature

* add changelog

* add UserProfile object, add loading indicator in start chat flow

* fix test

* add new section for user profile in start chat

* fix duplicates input on search bar

* Update ElementX/Sources/Services/Client/ClientProxy.swift

Co-authored-by: Alfonso Grillo <alfogrillo@element.io>

* Update ElementX/Sources/Services/Client/ClientProxy.swift

Co-authored-by: Alfonso Grillo <alfogrillo@element.io>

---------

Co-authored-by: Alfonso Grillo <alfogrillo@element.io>

ElementX/Sources/Services/Client/ClientProxyProtocol.swift

@@ -24,6 +24,8 @@ enum ClientProxyCallback {
 }
 
 enum ClientProxyError: Error {
+    case failedCreatingRoom
+    case failedRetrievingDirectRoom
     case failedRetrievingDisplayName
     case failedRetrievingAccountData
     case failedSettingAccountData
@@ -70,6 +72,10 @@ protocol ClientProxyProtocol: AnyObject, MediaLoaderProtocol {
     
     func stopSync()
     
+    func directRoomForUserID(_ userID: String) async -> Result<String?, ClientProxyError>
+    
+    func createDirectRoom(with userID: String) async -> Result<String, ClientProxyError>
+    
     func roomForIdentifier(_ identifier: String) async -> RoomProxyProtocol?
     
     func loadUserDisplayName() async -> Result<String, ClientProxyError>