Resolves largeTitle background color from topBar.title.background.color

Co-authored-by: Guy Carmeli <guyca@users.noreply.github.com>

This commit changes how stack child options are applied on iOS 13. Until now, options were applied directly to the navigationItem of the stack which is shared between all children.
This commit applies options on the navigationItem of each child instead. This fixes issues with color transitions when popping and pushing children to the stack.

* Fix topBar transparent background on iOS 12

* Fix unit test iOS destination

* Remove main window backgroundColor
* Better interface for TopBarPresenter