Move request for notifications permissions to HomeReadyScreen (#3977)

* cleanup the current logic

* add statsig logs

* implement requests for permissions where needed

* oops

* let `addPushTokenListener` handle the token registration

* place new log event type with the other `notifications` type

* place registration next to handler

* more organization

* only call `gate()` if permission is not yet granted

* be more specific to prevent gate pollution

* nit

* make `token` non-optional in `registerToken`

* remove `prevDid`, move `registerPushToken` into `useEffect`

* keep it outside actually

* nit

src/lib/statsig/events.ts

@@ -16,6 +16,9 @@ export type LogEvents = {
     logContext: 'SwitchAccount' | 'Settings' | 'Deactivated'
   }
   'notifications:openApp': {}
+  'notifications:request': {
+    status: 'granted' | 'denied' | 'undetermined'
+  }
   'state:background': {
     secondsActive: number
   }