A story is a logical container for composing a set of modules.
Stories and their associated state are stored in the user's Ledger.
The modular framework uses the fuchsia.modular.StoryShell interface to display the UI for stories.
Stories can be created, deleted, started, and stopped. Created and deleted refer to the existence of the story in the ledger, whereas started and stopped refer to whether or not the story and its associated modules are currently running.
