Bot Menu
Menu can be set for your bot to help people discover and more easily access your functionality throughout the conversation.
This menu is always available to the user and easily communicates the basic capabilities of your bot for first-time and returning users. The menu will automatically appear in a thread if the person has been away for a certain period of time and returns.
We can have top-level and nested menu items.
Top level of the Menu is limited to 3 menu items.
Sub menus are limited to 5 menu items.
