Support for viewpager,resource idling

Can we have support for viewpager with tablayout.
Use cases are-
- Current active tab
- Change tab selection as per index

Also, can we have something related to resource idling
the use case for this

- Click on tab layout index
- Wait till the list is visible (waitTillViewIsVisible)
- Click on 2nd pos

`fun waitTillViewIsVisible(matcher: Matcher): ViewAction = object : ViewAction {

override fun getConstraints(): Matcher {
return Matchers.any(View::class.java)
}

override fun getDescription(): String {
return StringDescription().let {
matcher.describeTo(it)
"wait until: $it"
}
}

override fun perform(uiController: UiController, view: View) {
if (!matcher.matches(view)) {
ViewPropertyChangeCallback(matcher, view).run {
try {
IdlingRegistry.getInstance().register(this)
view.viewTreeObserver.addOnDrawListener(this)
} finally {
view.viewTreeObserver.removeOnDrawListener(this)
IdlingRegistry.getInstance().unregister(this)
}
}
}
}}`

Review the existing Android testing support for ViewPager and TabLayout, then examine the proposed waitTillViewIsVisible action and its ViewPropertyChangeCallback approach. Define separate acceptance criteria for reading and changing the active tab and for waiting on resource or view readiness; completion should include working coverage for the listed tab-selection flow.

Escrita pelo modelo de indexação a partir do texto da issue.