* Add OnboardingStoryManager
* mark onboarding story viewed
* Add tests and fix issues that came up from testing
* up test timeout for slower CI
* rename SystemStoryManager and put into dependency injecton container
* Use viewed state on StoryMessage itself. Have SystemStoryManager observe app lifecyle events to automatically manage the onboarding story
* use iOS assets which are now in s3
* todo cleanup
* increment timestamp for uniqueness
* pr comments
* change literal delimiter
* Add ChainedPromise utility, tests, and use in SystemStoryManager
* discretionarily observe app backgrounding in SystemStoryManager
* renaming from PR comments
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