v4.0.0

• Breaking: interfaces no longer carry an I prefix. Every exported
  contract uses its bare name: SignalProtocolClient,
  SignalProtocolRelayServer, ProtocolStore, SessionStore,
  SenderKeyStore, IdentityKeyStore, KemPreKeyStore,
  SignalProtocolLocalStore, Logger, GroupServer, ProvisioningService,
  KeyRotationService, and the rest. Where the bare
  name belonged to the sole implementing class, the class is now
  DefaultSignalProtocolClient or DefaultSignalProtocolManager, and the
  low-level constructor call is DefaultSignalProtocolClient.create().
  createSignalProtocolClient() and createHostedSignalProtocolClient() are
  unchanged. The device-lifecycle contracts are DeviceLifecycleSecureStore,
  DeviceLifecycleConvexClient, KeyStorageOps, and DeviceLifecycleLogger,
  so the lifecycle logger no longer shares a name with the SDK Logger.