Create sessions through the user session manager

Sign-in now creates and stores its session through the
UserSessionManagerProtocol rather than the UserSessionStore, so the
AppCoordinator no longer holds the store.

- The manager forwards clientSessionDelegate and
  userSession(for:sessionDirectories:passphrase:) to its store. As with
  restoring, the new session isn't registered until the AppCoordinator
  adds it.
- AuthenticationService takes the manager, for both sign-in and soft
  logout.
- The store mock's configuration moves to the manager mock.

UnitTests/Sources/AuthenticationServiceTests.swift

@@ -15,7 +15,7 @@ import Testing
 struct AuthenticationServiceTests {
     var client: ClientSDKMock!
     var encryption: EncryptionSDKMock!
-    var userSessionStore: UserSessionStoreMock!
+    var userSessionManager: UserSessionManagerMock!
     var encryptionKeyProvider: MockEncryptionKeyProvider!
     var service: AuthenticationService!
     
@@ -36,8 +36,8 @@ struct AuthenticationServiceTests {
         switch await service.login(username: "alice", password: "12345678", initialDeviceName: nil, deviceID: nil) {
         case .success:
             #expect(client.loginUsernamePasswordInitialDeviceNameDeviceIdCallsCount == 1)
-            #expect(userSessionStore.userSessionForSessionDirectoriesPassphraseCallsCount == 1)
-            #expect(userSessionStore.userSessionForSessionDirectoriesPassphraseReceivedArguments?.passphrase == encryptionKeyProvider.generateKey())
+            #expect(userSessionManager.userSessionForSessionDirectoriesPassphraseCallsCount == 1)
+            #expect(userSessionManager.userSessionForSessionDirectoriesPassphraseReceivedArguments?.passphrase == encryptionKeyProvider.generateKey())
         case .failure(let error):
             Issue.record("Unexpected failure: \(error)")
         }
@@ -138,14 +138,14 @@ struct AuthenticationServiceTests {
         encryption = EncryptionSDKMock()
         client.encryptionReturnValue = encryption
         
-        userSessionStore = UserSessionStoreMock(.init())
+        userSessionManager = UserSessionManagerMock(.init())
         encryptionKeyProvider = MockEncryptionKeyProvider()
         
         let classicAppManager = ClassicAppManagerMock(.init(accounts: classicAppAccounts,
                                                             availableSecrets: availableSecrets,
                                                             secretsBundle: SecretsBundleWithUserIdSDKMock()))
         
-        service = AuthenticationService(userSessionStore: userSessionStore,
+        service = AuthenticationService(userSessionManager: userSessionManager,
                                         encryptionKeyProvider: encryptionKeyProvider,
                                         classicAppManager: classicAppManager,
                                         clientFactory: clientFactory,

UnitTests/Sources/AuthenticationStartScreenViewModelTests.swift

@@ -296,7 +296,7 @@ final class AuthenticationStartScreenViewModelTests {
         notificationCenter = NotificationCenter()
         
         clientFactory = ClientFactoryMock(configuration)
-        authenticationService = AuthenticationService(userSessionStore: UserSessionStoreMock(.init()),
+        authenticationService = AuthenticationService(userSessionManager: UserSessionManagerMock(.init()),
                                                       encryptionKeyProvider: EncryptionKeyProvider(),
                                                       classicAppManager: classicAppManager,
                                                       clientFactory: clientFactory,

UnitTests/Sources/LoginScreenViewModelTests.swift

@@ -230,7 +230,7 @@ struct LoginScreenViewModelTests {
         let appSettings = AppSettings.volatile()
         
         clientFactory = ClientFactoryMock(.init())
-        service = AuthenticationService(userSessionStore: UserSessionStoreMock(.init()),
+        service = AuthenticationService(userSessionManager: UserSessionManagerMock(.init()),
                                         encryptionKeyProvider: EncryptionKeyProvider(),
                                         classicAppManager: nil,
                                         clientFactory: clientFactory,

UnitTests/Sources/ServerSelectionScreenViewModelTests.swift

@@ -363,7 +363,7 @@ struct ServerSelectionScreenViewModelTests {
         client = factoryConfiguration.homeserverClients["matrix.org"]
         clientFactory = ClientFactoryMock(factoryConfiguration)
         
-        service = AuthenticationService(userSessionStore: UserSessionStoreMock(.init()),
+        service = AuthenticationService(userSessionManager: UserSessionManagerMock(.init()),
                                         encryptionKeyProvider: EncryptionKeyProvider(),
                                         classicAppManager: nil,
                                         clientFactory: clientFactory,