Add support for androidx test packages

[plattysoft]

Current library adds support to do screenshots via android.test using ActivityTestRule, which is deprecated in favor of ActivityScenario.

We should provide 2 separate versions, one (the current one) for the old test library for compatibility reasons, and a new one based on the code of the new classes.

OR find another way to access the activity to take screenshots that is not depending of ActivityTestRule.