Make analytics much more useful to transit agencies

[aaronbrethorst]

Although both our iOS and Android apps report analytics data back to Firebase Analytics, they don't report data back in identical fashion. We need to:

1. Create a list of every place where an analytics event is reported in the iOS and Android apps—along with the names and reported data from those events
2. Figure out whether we want to use the iOS or Android page/dimension/event name—or choose an entirely new one—and then unify the name across both platforms.

This issue has also been opened on the OBA iOS repo at https://github.com/OneBusAway/onebusaway-ios/issues/724 — whomever works on this issue also needs to work on the other one.