Add support for auto adding menu item for post type added by scaffold

[WybeBosch]

https://developer.wordpress.org/cli/commands/menu/item/

# Option1:Add an existing post to an existing menu
$ wp menu item add-post sidebar-menu 33 --title="Custom Test Post"
Success: Menu item added.

# Option2:Create a new menu link item
$ wp menu item add-custom sidebar-menu Apple http://apple.com
Success: Menu item added.

# Example on how to Delete menu item
$ wp menu item delete 45
Success: Deleted 1 of 1 menu items.