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/Screens/RoomScreen/RoomScreenModels.swift

@@ -28,6 +28,7 @@ enum RoomScreenViewModelAction {
     case displayMediaPicker
     case displayDocumentPicker
     case displayLocationPicker
+    case displayPollForm
     case displayMediaUploadPreviewScreen(url: URL)
     case displayRoomMemberDetails(member: RoomMemberProxyProtocol)
     case displayMessageForwarding(itemID: TimelineItemIdentifier)