Create poll UX (#1571)

* Add poll attachment button

* Add poll creation feature flag

* Setup navigation to CreatePollScreen

* Add create/cancel actions

* Add create poll screen ui skeleton

* Add bindings in CreatePollScreen

* Add logics in CreatePollScreen

* Cleanup code

* Fix option deletion crash

* Fix conflicts

* Add create poll logic

* Add localisations

* Fix test build errors

* Fix crash

* Add UTs

* Add accessibility IDs

* Add ui tests

* Add 240 char limit

* Fix addOption hide behavior

* Add maxNumberOfOptions

* Cleanup code

* Move delete workaround in the view model

* Use compound delete icon

ElementX/Sources/Application/AppSettings.swift

@@ -41,6 +41,7 @@ final class AppSettings {
         case swiftUITimelineEnabled
         case pollsInTimeline
         case richTextEditorEnabled
+        case pollsCreationEnabled
     }
     
     private static var suiteName: String = InfoPlistReader.main.appGroupIdentifier
@@ -241,4 +242,7 @@ final class AppSettings {
 
     @UserPreference(key: UserDefaultsKeys.richTextEditorEnabled, defaultValue: false, storageType: .userDefaults(store))
     var richTextEditorEnabled
+
+    @UserPreference(key: UserDefaultsKeys.pollsCreationEnabled, defaultValue: false, storageType: .userDefaults(store))
+    var pollsCreationEnabled
 }