Enhancement: PageController property

[lcyper]

Is your feature request related to a problem? Please describe. I want to be able to control what screen is seen using a controller, I can activate it with a button or a timer function, the thing is that I want to have a controller.

Describe the solution you'd like

final PageController pageController = PageController();

IntroductionScreen(
    pageController: pageController
    ...
)

pageController.setPage(1) pageController.next()

make it so that the counter can be sent to the parent as a parameter, so we have access to the controller.

thanks.