Login state factory interface

LoginStateFactory.kt

interface LoginStateFactory {
  /**
   * Creates a state to handle existing user's password entry
   * @param data Login data state
   */
  fun passwordEntry(data: LoginDataState): LoginState

  /**
   * Creates a state to check email/password
   * @param data Data state
   */
  fun checking(data: LoginDataState): LoginState

  /**
   * Creates a state for password error screen
   */
  fun error(data: LoginDataState, error: Throwable): LoginState
}