Guided tour for new users (#4690)

* Add home guided tour (WIP)

* Add web handling of the tour

* Switch to our fork of rn-tourguide

* Bump guided-tour

* Fix alignment on android

* Implement home page tour trigger after account creation

* Add new_user_guided_tour gate

* Add a title line to the tour tooltips

* A11y improvements: proper labels, focus capture, scroll capture

* Silence type error

* Native a11y

* Use FocusScope

* Switch to useWebBodyScrollLock()

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Co-authored-by: Eric Bailey <git@esb.lol>

src/lib/statsig/gates.ts

@@ -6,5 +6,6 @@ export type Gate =
   | 'request_notifications_permission_after_onboarding_v2'
   | 'show_avi_follow_button'
   | 'show_follow_back_label_v2'
+  | 'new_user_guided_tour'
   | 'suggested_feeds_interstitial'
   | 'suggested_follows_interstitial'