* feat(metrics): add onboarding screen metrics and section navigation
Fixes#16100
Adds metrics for navigating to the different screens of the onboarding and when navigating to a new section while logged in; only when enabled of course.
I refactored the code a little to make it simpler. I moved the check to see if the metrics collection is enabled in the async task itself, so we don't have to check it each time we add a new metric
* fix metric sent from module
* review comments
* add flowtype
42a9530452