KeyVerificationCoordinator: Refactor and add a single init with a KeyVerificationFlow enum parameter.

Riot/Modules/KeyVerification/Common/KeyVerificationFlow.swift

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+/*
+ Copyright 2020 New Vector Ltd
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+import Foundation
+
+/// Key verification flow used by KeyVerificationCoordinator
+///
+/// - verifyUser: Start a user verification.
+/// - verifyDevice: Start a verification of another device.
+/// - completeSecurity: Wait to be verified by another session after login on a new device.
+/// - incomingRequest: Manage an incoming key verification request.
+/// - incomingSASTransaction: Manage an incoming SAS verification transaction
+enum KeyVerificationFlow {
+    case verifyUser(_ roomMember: MXRoomMember)
+    case verifyDevice(userId: String, deviceId: String)
+    case completeSecurity
+    case incomingRequest(_ request: MXKeyVerificationRequest)
+    case incomingSASTransaction(_ transaction: MXIncomingSASTransaction)
+}