add load session function that does not dispatch (#3396)
add load session function that does not dispatch (#3396)


msft-shahins/BotBuilder,stevengum97/BotBuilder,yakumo/BotBuilder,yakumo/BotBuilder,stevengum97/BotBuilder,msft-shahins/BotBuilder,yakumo/BotBuilder,msft-shahins/BotBuilder,msft-shahins/BotBuilder,stevengum97/BotBuilder,stevengum97/BotBuilder,yakumo/BotBuilder