Completion Suggestion view for user mentions (#1859)

* created the list but I need to find a way to overlay it

* make the list able to have an intrinsic height

* best solution so far but does not work with expansion

* needs testing

* more scalable solution

* tests completed

* changelog

* injecting the media provider

* fix tests

* pr suggestions

* better testing

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -233,7 +233,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         appSettings.$readReceiptsEnabled
             .weakAssign(to: \.state.readReceiptsEnabled, on: self)
             .store(in: &cancellables)
-
+        
         roomProxy.members
             .map { members in
                 members.reduce(into: [String: RoomMemberState]()) { dictionary, member in