When a Stack’s root was set with an id of one of the Stack’s current children, there was a crash
since the wrong elements were removed from the stack.

This commit fixes this by creating a new stack when setStackRoot is called, and destroying all ViewControllers from the previous Stack.

Fixes #5117

* Cleanup and reorganise playground app

* Separated tests into three categories
  1. Layouts - layout specific tests and feature showcase
  2. Options - options related tests; interactions between static and dynamic options, merge options etc
  3. Navigation - general navigation features; Orientation handling, events, Overlay etc

* Fixed a few Android bugs
  1. testID wasn’t applied on TopBar react buttons
  2. static options were disregarded when creating initial BottomTab options
  3. Trying to open a none existent SideMenu would result in a crash

* Fix e2e tests

* Fix lint

* Few fixes + split push from SideMenu test into two tests

* Fixes e2e